i've got a neighbour does the same, to lazy to go and shut the traps at night so birds come out at first light. but all the birds will be in the loft to roost overnight so by shutting it 1st thing they won't come out!
there are probably a lot around that area being fed awaiting the weather to improve before being released. Not a lot of point reporting them as owners find it to much hassle to get the birds back!