I too was a recent victim of theft. I had been working on the interior and wiring and had lots of tools, though of Harbor Freight origin, and a year-long collection of wood and machine brass and stainless connectors, screws, nuts, bolts. They also took one of the 3 AGMs on board [I guess they were too heavy] to load out of the forward hatch. Replacement cost of all was probably $2500 total. Agony of replacement and not having what you want right at hand: About $10k.
I was VERY pleased with the way Boat US and my homeowner's insurance [Wawanesa] handled the claim. After the deductibles, I got about 75% of my claim. BUS was very liberal with their definition of "boat related equipment". Wawanesa was apparently happy enough that I reported the dual coverage so they did not quibble about the rest, though they were helped by the deductible.
The large urban marina is another story. They have a camera at the gangway serving 3 docks. I could only pinpoint the theft between Sunday and the following Saturday. That's a lot of mind-numbing footage to review and I knew I would be the only person on the planet willing to undergo that torture [the resolution, particularly at night, precluded speeding it up]. They would not let me look at the security footage and only told me they saw nothing unusual. To offload all that stuff through a 12 X 16 hatch would have taken hours and they saw nothing!? The marina has no liability, and no one on the dock has any expectation of privacy from the camera, so why the secrecy?