This time they found the box as well. Last time it was 4 of them and mine adopted them so they thought they were hers and I took them in. This time they've realised someone must be dumping them. Only one found. Exactly the same age as the other ones when they were found and looks exactly the same 
I've taken it in for now but I can't keep it on indefinitely because my 4 have a delicate balance as it is.
Why do people do that