This has bn a big problem in past couple years in Boston and I don’t know why but the best thing you could do is put cat back outside ASAP ( b4 cat loses all sense of what more then likely is his real home. I’ve had 3 Cats in my lifetime ( all in Boston) and every one to this day s let out when he/ she wants. A cat was put down do to an older woman posting flyers etc yet not computer savvy . That cat looks plenty healthy and ppl should not be taking any animals they “ think” are missing into there homes…