Tricky isn't it? Had it not caught fire there might not be a need for an insurance claim. On the other hand its quite shocking that the boat wasn't found sooner, and without the fire. But then the absence of any photos or other information was almost as though they didn't want it to be found.
On the other, other hand, heading north like that up a blind alley suggests the thieves knew nothing about boating and when they eventually figured it out they set fire to it, pushed it out and scarpered, rather than go back past where they nicked it from.