I would guess a GT 630 or something along those lines. Maybe a slightly older model. I doubt it'll be anything faster than that though.
Just going by their B-Stock page, I doubt it'll be anything from before the 600 series. It doesn't look like they have much left under $80 aside from the super low end G210 and 8400GS cards.
If it does turn out to be something decent, I might have to go stick something in the fan of my 8800GTX and let it run a burn in test for a few hours (minutes?) to finally get that thing replaced with something that doesn't pull 180 Watts out of the wall at full load.
... kidding... I wouldn't abuse an RMA like that. Plus, its a nifty part of my GPU collection, though I wouldn't cry if I could have something more practical in its place if it actually fails.
Desktop - i5 2500K@4.2Ghz - MSI P67A-G43 - 16GB DDR3-1866 - PNY GTX 970 - Samsung SM841 128GB
Laptop - Asus Q500A - Core i5 3210M - 6GB DDR3-1600 - 840 EVO 256GB - AUO 1080P
HTPC - i5 4590 - Asus B85 - 8GB DDR3-1600 - 64GB Crucial C300