Do you have screened bottom boards or solid? Sometimes I find small wax moth and hive beetle larva on the plastic board under the screened bottom board where they are eating the wax debris, dropped pollen, etc. that fell through the screen. I just dump the garbage and the larva where the fire ants can get them and clean the board off and re-insert it if I want it in the hive. If I need ventilation, I leave the board out. Usually the bees will keep the garbage cleaned out if they can get to it so the SHB and wax moth larva are not a problem. Use beetle traps between frames or one of the oil trays under the screened bottom board. You can find DIY plans or buy pre-made trays from suppliers.