Oh no, I'm so sorry.
When our first bun, Mizz, went to the Bridge her husbun, Rio, went a bit feral and we were always losing him, finding the gap, blocking it up and losing him again ......
In my experience if he has got out he is likely to come back when he is hungry. Does he have pellets, if so, shake the pellet bag, box or whatever and keep calling his name.
Are you in the countryside, or in a town?