Princeton and the Euaion painter

There is an interesting pot sherd in the Princeton University Art Museum. It was acquired in 2002 in memory of Emily Townsend Vermeule. It is attributed to the Euaion painter. Who made the attribution?

The sherd does not appear to be in the Beazley Archive. When did it surface? What is its collecting history? Who was the donor?

An email to the relevant curator has gone unacknowledged.

An email to James Steward, the Director of PUAM has gone unacknowledged.

Can we assume that the PUAM does not wish to release the collecting history?