I attended that auction. It had "a little bit of everything", but the primary focus seemed to be GE industrial locos and parts. Several locos were auctioned off at the site, including a nice little 25 ton GE. There were other manufacturer's parts, as well; I recall an entire pallet of new EMD power assemblies, still in the original boxes, going for next-to-nothing.
One of the center cab GE's had the name "Dufferin" in the cab, which (I found out later) is a name that is prominent in Canada, and in Ontario especially. This might support the Canadian connection.
I can't say for sure that the Donner Hanna SW1s went in that auction, although they might have. However I do recall that two industrial locos that were located in LeRoy at one of the stone pits, did go in that auction. If memory serves, one was a standard gauge 45 ton, and the other was a narrow gauge center cab that had come out of Bethlehem Steel.
1991 seems about right for the auction year.
JR