Pontic amphora withdrawn from sale in New York

Pontic amphora from the Becchina archive.
Source: Dr Christos Tsirogiannis

Christie's (New York, 18 April 2018, lot 26) has withdrawn a Pontic amphora, attributed to the Paris painter, after the pot was identified from the Becchina archive by Dr Christos Tsirogiannis. 

Christie's state that the history of the piece is as follows:

• with Galerie Günter Puhze, Freiburg;
• Acquired by the current owner from the above, 1993;
• Manhattan private collection.

Tsirogiannis has drawn attention to the notes from the Becchina archive that shows that the amphora was dated 22 June 1993 (along with the price paid and sold, in Swiss Francs, viz. 30,000 / 47,000 SF). 

If the amphora was purchased from the Freiburg gallery in 1993, and that the piece was still with Becchina in late June of the same year, was Puhze buying directly from Becchina? What other Puhze material came from this same source?

Who restored the amphora? When did this happen?

An Attic black-figured amphora that had passed through Puhze (after surfacing through Sotheby's) was returned to Italy.