According to evidence collected by the Dutch authorities and presented in court, the theft was carried out by three men, eventually identified publicly as Douglas Chesley Wendersteyt, Bernhard Zeeman and Jan B., acting in concert.  At approximately 03:45 in the morning, the burglars used an improvised explosive devise, or IED, made from a Ti-Rex flash banger firework attached to the garden underground emergency exit of the Drents Museum.  The force of this detonation allowed accesses into the museum by causing damage to the museum's entry point as well as damaged several buildings on the Brink, shattering nearby windows.

CCTV footage, captured during the burglary, showed that the accomplices spent only a few minutes inside the museum. The smallest of the three men entered first and moved directly toward the display case containing the golden helmet of Cotofenesti, (pronounced /kotsofeneʃti/), a Geto-Dacian helmet dating to the 5th century BCE made from almost a kilogram of gold.  After striking the case repeatedly with a sledgehammer, he removed the helmet and placed it in a bag. A second offender targeted another display case and succeeded in removing the three gold spiral Dacian bracelets from the Sarmizegetusa Regia archaeological site. The third participant also attempted to break into a display case but failed to gain access before the group fled the museum.

According to the court's record it seems that the operation had been carefully prepared. The accomplices acquired a hammer, crowbar, and other tools in advance of the museum's break-in, arranged vehicles, rented accommodation, and coordinated their movements before and after the burglary. Following the theft, the group escaped in a grey Volkswagen Golf, stolen in Alkmaar, which was later set on fire under the viaduct of the N33 at the Grolloërstraat, at the intersection of Grolloërstraat and Marwijksoord, near Rolde before the thieves transferred to another vehicle.

When the news broke of the theft, it caused immense anger in Romania over the loss of such important national treasures. As a result, the director of the National History Museum of Romania, Ernest Oberländer-Târnoveanu, was fired.

The subsequent investigation became one of the largest heritage-crime inquiries in recent Dutch history. Through forensic evidence recovered, surveillance footage, witness testimony, telecommunications data, and an extensive undercover operation, prosecutors ultimately secured convictions against these three participants. 

Law enforcement's first breakthrough came on 29 January 2025 when three individuals from Heerhugowaard were taken into custody. The Dutch police publicly identified two of the suspects as Douglas Chesley Wendersteyt and Bernhard Zeeman, releasing both their names and photographs to the public. The third person arrested was not named, but was reported to be the partner of one of the suspects.  The names of two of the identified accomplices were made public in hopes of flushing others involved in the burglary.  April 2025 saw another breakthrough in the investigation when the police identified several additional suspects.  Around the same time, authorities announced they were actively seeking a suspect captured on CCTV footage wearing a Nike cap and glasses and visiting a hardware store in Assen shortly before the burglary.

While the judgments provide a detailed reconstruction of how the theft was planned and executed, they also addressed a question that has lingered since the spectacular burglary first made international headlines: why were these objects stolen in the first place?

The court's answer is remarkably consistent across all three charged individuals.

Despite extensive investigations, multiple arrests, an undercover operation, and eventually the recovery of the helmet and two of the bracelets, the judges acknowledged that they never received a direct explanation from the defendants themselves. Throughout interrogations and their later court proceedings, the the charged individuals, largely remained silent regarding their motivations.

As a result, the court was forced to infer motive gleaned from the available evidence. Its conclusion was unequivocal.

"The court remains left to speculate as to the motive, but it cannot conclude otherwise than that the defendants were guided by financial gain."

That observation appears repeatedly throughout the judgments and represents the clearest judicial assessment of the case.

The Undercover Operation

Perhaps the most revealing evidence concerning motive emerged during the undercover police operation following the break-in.

Dutch investigators deployed officers posing as intermediaries for purported buyers interested in acquiring the stolen artefacts.  During a series of meetings, one of the accomplices, named publicly only as Jan B., discussed the theft, the whereabouts of the objects, and the possibility of transferring them.

The conversations centred on value, payment, and negotiations. At one point, a proposed payment of €400,000 was rejected as being insufficient. In another conversation, the accomplice explained that the theft had been carried out "as one team" and therefore had to be resolved collectively.

For investigators, these conversations reinforced an interpretation that had already begun to emerge from the broader evidence. The stolen artefacts were being discussed not as cultural treasures, but merely as assets with a substantial monetary value.

A Familiar Pattern in Heritage Crime

The judgments against the three indicted individuals highlights a recurring feature of major cultural property offences.

The Golden Helmet of Coțofenești and the Dacian bracelets surely possess extraordinary historical, artistic, and symbolic importance. Yet the court found no evidence that these qualities themselves were motivating factors in their selection by  the thieves. Instead, the available evidence pointed toward personal enrichment.

The judges repeatedly emphasised that the defendants in this case had offered no alternative explanation for their actions.  In the absence of such an explanation, and considering both the planning of the offence and the discussions recorded during the undercover operation, the court concluded that financial gain remained the only plausible motive.

Recovery and Convictions

A significant breakthrough occurred in March and April 2026 when the Golden Helmet of Coțofenești and two of the stolen bracelets were returned to Dutch authorities as part of negotiated procedural agreements between prosecutors and two of the three defendants.

The recovery of the Helmet of Coțofenești and two of the three stolen gold bangles, announced by Corien Fahner, the head public prosecutor at the OM Noord-Nederland, represented an extraordinary success for investigators and ensured the return of some of Romania's most important archaeological treasures. Nevertheless, the judgments issued yesterday makes clear that the return of the artefacts occurred more than a year after the theft and only after the participants had been identified and were subject to prosecution.

In the end, the three judgments offer a rare judicial examination not only of how a major museum theft was committed, but also of why. The answer reached by the court was neither ideological, political, nor cultural.

In the judges' view, the most plausible explanation was also the simplest: the offenders acted for financial gain.

For heritage-crime researchers, the Drents Museum case serves as a reminder that even spectacular crimes involving objects of immense cultural significance are often simply motivated by ordinary criminal incentives. Behind the international headlines, diplomatic concern, and public fascination, the court ultimately found a motive familiar to investigators across the field of art crime. Money.

The complete verdicts (in Dutch) which can be found here state that:

The court imposed a prison sentence of 47 months, less time served in pre-trial detention against Bernhard Zeeman.

The court imposed a prison sentence of 47 months, less time served in pre-trial detention against Douglas Chesley Wendersteyt.

The court imposed a prison sentence of 47 months, less time served in pre-trial detention against the defendant known as Jan B.

The Statement from the Drents Museum after the verdict can be read here.