Being super cheap and not good at working on EM's, I'd still consider buying these, but I'd nicely offer $200 and explain that they can take considerable time to repair. Maybe he'll counter offer $300.

If they worked before the move, it might just be a matter of looking for anything that jarred loose, or disconnected. Frequently they're moved with the hopper, and COINS, inside. The coins fall out and cause "unwanted connections" that you don't want! If you do get them, thoroughly inspect for that before you plug them in.
Hopefully other members will chime in here.