A certified translation of the Jordanian export document, made by an obscure copy shop and dated 12 October 1992, four years after the Arabic document was issued states as follows:

In a previous UK inquiry, when questioned about the legitimacy of a grouping of his incantation bowls loaned to UCL in London, Schøyen noted that he had not kept any of the importation papers or a series of poor quality photos associated with his sales purchase.  This “plausible denial” is a technique ARCA frequently records with regularity among dealers and or collectors of ancient art without substantiative legitimate provenance.  The individual in question affirms that they had the documentation or they saw the documentation at one time in the past, but in the subsequent years, said documents, were they to be export licenses, bills of sale, ownership letters or shipping documents failed to be retained with the object in question. 

In the transcript of an Al Jazeera documentary,  Iraqi authorities, via a confidential informant, believe Al Rihani received Iraqi artefacts smuggled out of North Iraq sometime around 1991, shipped through intermediaries from Amman Airport to Al Rihani in London.

Exhibit MS 2340 - The Schoyen collection. This cuneiform tablet is the oldest Sumerian record of musical writing and dates to 2600 BCE.  The tablet is the description of 23 types of harps

Due to the broad wording of the original 1988 invoice, Ghassan Al Rihani may have simply reused the export document repeatedly, to substantiate additional illicit material in circulation in London and elsewhere.  Hundreds of artefacts that passed through this family's hands were then purchased by Martin Schøyen directly, some of which have been sold onward and were not retained by Schøyen in the long term. 

For those that want to learn more about the controversies of this collection, I suggest reading scholars Christopher Prescott and Josephine Munch Rasmussen 2020 article ‘Exploring the “Cozy Cabal of Academics, Dealers and Collectors.”  Another excellent reference is the Biography of P.Oxy. 15.1780 by Roberta Mazza of the University of Manchester from Volume 52 of the Bulletin of the American Society of Papyrologists.