For what it's worth, I agree that it does appear to be a Blueberry model. With any luck it's the 400 MHz model with FireWire. M5521 is what they used on all the slot loaders. If they had angled that second picture a little more we'd be able to see if the FW ports are there or not.

Unfortunately it's not Lime, or Sage. I don't think I've seen a Sage iMac in person since they were brand new on display at MWNY 2001 now that I think about it. Certainly a color I'd like to have though. Snow was one of my favorites, and I've got a 600 MHz one of those though that still has a spot on the desks in the back room. The Indigo 400, Graphite 600 and Grape 400 w/bad DVD+HD are in the basement. I had a Blueberry 350 from a yard sale that I traded for the Graphite 600.[/off topic ramble]

Did you end up winning the auction?