The two 370/slot 1 boards would be worth investigating and repairing if at all possible, they are nice boards to have, they also sell decently to collectors due to the dual CPU socket design. I would also go through the rest and check online to find any board that may be rare or noteworthy and if you are not in a position to repair them then possibly consider selling them to collectors who would be.
There are a few LGA boards there that look like their sockets might be damaged, if so then these boards while not unrepairable would be extremely hard to fix without he right equipment like a PCB preheat bed.
Personally I would go through that lot and find the boards most likely to be easy fixes, like bad caps or cleaning and put them into a repair pile. The hardest ones or unfixable throw them into a big job lot and see if anyone is willing to take them off my hands via eBay or local listing, I know there are a lot of people right here on Vogons that are into repairing retro motherboards and have the knowhow and equipment.
Would be a shame to see any of them end up in recycling but its likely quite a few of them will.