While I do not know the specifics of this sale, I do know that it is museum policy to take donated items that are not specific to the 2' gauge lines and sell them (usually on ebay) to help fund the museum. This is also how the gift shop is stocked with misc. railroad books, etc. It's a great way to take care of the needs of the museum - especially since we have a specific, narrow focus.
The photos on ebay were certainly taken at Sheepscot. I think I saw the bell and headlight when I was up there last Saturday.
-Ed Lecuyer