Hi Ela,
You will remember Pumpkin from the aol board.
No i dont know for certain that they dont flea and worm him but when he started turning up again at mine he was covered in fleas.
When i spoke to his owners last year the fella didnt have a clue about cats, he was very much "its just a cat" kind of fella !
I do however think you are right in that i should speak to his owners.
I cant find their phone number so i will wait for them to put a new flea collar on him and then attach my phone number again.