I moved out over three years ago. He was out when I left (he knew I was going), I locked the door behind me and he would have had to unlock it when he returned.
The DDs sometimes arrive at his house before he gets back, so they let themselves in. DD2 goes there more often and uses the keys that DD1 used to have, so DD1 (who has just explained to dad that she has already collected her things while he was out this afternoon 'using the spare key that mum has') has asked him can she keep these keys to use on future visits. ExH says no, they must be returned and he will be discussing it with me. He won't, since he will email me and I will neither read it nor respond to it.
I guess he is terrified I will go over there, let myself in and rifle through his underwear drawer or sew prawns into the hems of his curtains. Since I have had ample opportunity to do that in the last three years and haven't done so, you'd think he know better. I will give these keys back, but then DD1 won't have a set and I could still use DD2's set if I was desperate to gain access, which I'm not.
I hope he is fuming and spends ages composing me one of his usual hatred-masked-as-politeness emails so I can delete it without reading it 