The guy from inchworm was blowing smoke up your skirt when he said you could get $500 for the housing with a bad motor and no gears- that's the going rate for a fully functional e-locker diff with stock (4.11) gears.
If you plan to post this up in classifieds you may want to do a reality check on your pricing.
I bought an entire fzj80 rear end with a working e-locker and disc brakes for $400.