Hi overstrd
I pick up JBLs from time to time. I would say if they have been stored in a decent space away from humidity, and the parts are original and working fine, you could be looking between $1200.00-$2500.00 for them. You being the only owner means a lot. If you have the original shipping boxes and paperwork that's a bonus. If they were "mint" you could ask any amount.
good luck
Michael Green