And, yes, there it was. But it was locked. I didn’t feel like forcing it, and in fact might not be able to. The construction seemed a little more solid than my previous experience, and it was probably alarmed. In went the fleas, and a few seconds later the alarm sensor was jammed and the door sprung open. I couldn’t leave it unlatched like that, but I could instruct the fleas to permanently disable the locking mechanism.