Russ,
If no one on Team AnandTech wants them, might you considering waiving the 'must be a memeber of TA' requirement? Though I don't actually crack for AnandTech, I've been lurking this messageboard since just after the team was formed. I've even posted a few times with (I think) useful information.
Anyway, I might be interested in those motherboards, though more information would be great. Pictures would be ideal as I could probably identify them, but I don't necessarily want you go through too much trouble for this. The problem is those socketed type boards could be relatively recent G3 class boards, or they could be "ancient" 68030 or 68040 boards. Do they have standard PCI slots? Do you have any idea how old they might be?
Thanks for your time.