I hope I didn't come across as bashing pet stores for keeping several BPs in a single enclosure...just pointing out that, for whatever reason, no one working at the time could confirm/deny that this snake had eaten at any point during his stay (or his life, for that matter, lol). To be fair, the "reptile person" wasn't there when I purchased the snake, and that person may have been able to give me a lot more information. As it was, with no feeding history, I figured it couldn't hurt to offer him something.
Thank you (and everyone else who responded)!