Ouch -I am feeling my thumb right now. Filou also one time escaped for an hour or so. He is VERY good in vanishing in the apartment so it took some time before we saw he was not in
When we opened the outside house door he was ready to come in again We were very lucky because a street with much traffic is only 100 m away (1/16 mile ) and some of the outdoor cats in our neighborhood have been killed there

It's a big relief that you have him back I am sure.