The Michael C. Carlos Museum and an Apulian Fishplate

Source: Michael C. Carlos Museum

The Michael C. Carlos Museum at Emory University has noted that it will be returning an Apulian fishplate attributed to the group of Karlsruhe 66/140 (inv. 1986.015). The website provides the so-called 'provenance':

Probably with Gianfranco Becchina, Zurich, Switzerland. Ex coll. William Knight Zewadski, United States, purchased from Sotheby's London, 17 May 1983, lot 261. Deaccessioned by MCCM for repatriation to the Italian Republic, August 29, 2023.

What does 'probably with' mean? What is the basis for returning the fishplate? Who consigned the piece to Sotheby's in London in 1983? 

What other ex-Becchina pieces in the Carlos Museum need explaining?

I am grateful to Dr Cynthia Patterson for drawing my attention to this piece of information.

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