Yup having the same issue. Random broken appliances, dropped by random sims, at random places on the lot that after you repair them have just the normal interactions. I would expect my sims to be able to take them home , and either use or sell them. Mine currently has been converted to a makers space, si no idea what happened to the ones that where left there. However at some point i did find a stereo at a completely random place, that my sim could not put in inventory because it "didn't belong" to my sim. I assume that since it's at the moment on a makers space and sims will repair broken stuff, someone dropped it and someone else repaired it when i wasn't looking
