Now our cleaner told everybody of course and one other neighbor told her that some farmers (we still have quite some farms in the area) catch cats and put them in their barns for some time so that they help keeping the mice down. They let it free after a week or so.
It does sound estrange to me. Why they should spent time and energie, and possibly some cat scratch when it's so cheap and easy to have a couple of barn cats.Yes, they can reproduce,but is they are this kind of people I bet they won't get any problem on putting the new borns to sleep.

Being and indoor/outdoor maybe he has been stuck somewhere and being feeded.

Anyway, glad he is back to home.