My indoor cat is lost outside. What do I do?

Sorry for this being long! We have had three Persian cats for around 7 years now. One of them, Sushi, a white-furred friendly boy who gets scared easily snuck out of the front door while it was open 3 and a half days ago. We didn't think he had gotten out as the door was only open for a few minutes. ... show more Sorry for this being long!

We have had three Persian cats for around 7 years now. One of them, Sushi, a white-furred friendly boy who gets scared easily snuck out of the front door while it was open 3 and a half days ago. We didn't think he had gotten out as the door was only open for a few minutes. However, the next day when we called for him with treats he didn't respond so we searched all over for him and couldn't find him. After we finally realised he had gotten out, we did the usual. We looked around for ages, set up posters, asked neighbours, tried luring him back with the smell of familiar items. One neighbour two doors down said Sushi had been in his front garden when he came home from walking his dog on the night he had escaped on. Everybody else was sympathetic but had no other news. We read about it and turns out when frightened in new surroundings, indoor cats can just find a safe place to hide and stay there until they starve to death or something scares them away. We don't think Sushi has gone far from our house, he would be too scared to move. It has rained quite a lot over the last few days and he has never been outside from the front before and doesn't have a clue about survival. We think that he is hiding in someone's garden now. Is there anything we can do to locate him or find out who's garden he's in?
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