dbcollen;
These are NiMh type batteries. They can be very good work horses and since they can bounce back from being drained down to as low as 80% empty, they could be used in front of your current 1000Ah setup as the main draining batteries and let the 1000Ah set bring them backup to full charge.
Otherwise I'd look into maybe breaking them up, you can set them, depending on how much work you want to do :-) into 10-cell packs which would give you 12.0Vdc at rest. Actually more like 12.5Vdc at rest, then build up it at nearly any setup you wish.
I'd put my hat in the ring to bribe you out of them , BUT TomW spoke first
Other idea would be to offer them up on Craigslist or one of the Prius forum in your area, they'd love to get their hands on them.
ONE thing to be checking on....! voltages once you have the back into individual cells, a lot of times the inner cells are going bad due to poor connections from years of being bounced.
Cheers!! Great find/gift!!
Bruce S