So, and with reference to your other posting regarding damage between the keel and hull connection, it appears your boat was under charter in the recent past, and your charters have run the boat into something hard causing damage to that connection. I would suggest that your charter manager is probably aware of this, but has not told you yet. There are some wholly irresponsible charterers who would not report having had an incident, particularly if there was nothing immediately obvious. You need to keep your wits about you and ensure that you have a good lawyer. Get a copy of the charter firms insurance cover details and be ready to take them to court. You need to get statements from the charter firm, confirming how the boat was damaged, and in regard to the theft you should ask your charter manager for a copy of the police report regarding the crime. Don't give anybody the benefit of doubt. If you have your own insurance then you need to advise them and tell them that you hold the charter firm liable. Also if your boat is kept in a marina, ensure that the marina manager knows that a crime has been committed aboard your boat, and that you hold them at least partially responsible on account of the lack of security which allowed criminals onboard. Was your boat locked up prior to the criminals getting onboard in which case there should be evidence of a forced entry, and if not, then your charter manager is at fault for not keeping the boat secure.
Good luck in getting this matter sorted out, you will need all the luck you can get.