I suggest configuring an airplane to use only PALLET1 on the FWD cargo door, and PALLET2 on the AFT, and try a Deboarding and see which one is which. Repeat the same with PALLET3 and PALLET4 and try again, then again with PALLET5 and PALLET6, and again with PALLET7 so, with 4 Boardings you could figure out all the available models.