Hard to tell from that dark grainy picture, but blowing it up, they might be dead "pill bugs", also called "roly-poley" bug, "doodle bugs" "wood louse", etc. etc. If so, they are harmless, don't spread diseases, don't destroy anything and are about as benign as you can get. They hide in dark moist places and eat decaying plant matter. So likely someone had garbage rotting under the cabinets at one time and it attracted them, then once it was cleaned out, they died of starvation. To be sure you can take a dead one down to a nursery and see if anyone there can tell you.