There has to be more to this though. Because even if Dexter successfully gets into the vault and takes his slides, wouldnt it still be really suspicious to Prater that just the slides just sort of went missing? Dexter wouldnt do this until he was found out, or otherwise ready to cut all ties to Prater completely and willing to reveal to Prater that hes the BHB. So something is going to happen that triggers Dexter making a last stop on his way out to collect what belongs to him, but I wonder if that means Prater is dead, or is after Dexter at that point, or if Dexter just doesnt care if Prater is alerted to the fact that the BHB just snuck in and took his slides back. But maybe Dexter sets the whole place on fire and destroys everything to hide the fact the slides were the goal. Who knows?