DR I make a point never to get involved in a marital dispute - there are no winners. Except maybe the bird with the free cat!!!
Seriously though, I feel for ya man. (No, not you DR, the guy with the missing cat.) My ma just had a similar thing happen to her. She and the Mr parted, he was gonna buy her out and then... OH! The boat has disappeared. WTF??? My only adviceould be to invest in some beefed up security. What are those tracking devices worth? The ones that text your cellphone if your boat moves? A lot, I guess.