Hi all,
I would encourage anyone with questions about this type of thing to chat with an insurance agent instead of speculating -- I think speculating causes a lot of unnecessary heartache.
I asked exactly this question of both BoatUS and State Farm agents (and another insurer that I don't remember) with respect to exactly this type of boat and type of history.
When I asked BoatUS about it, they told me that histories like that didn't really change things for older boats, which all had histories and uncertainties. She said that they are basically all in the same bucket of needing a survey or they could be anything. Newer boats would be different and a history could trigger a survey that otherwise wouldn't be needed. Effectively she said that older boats all had histories, known or not, so it wasn't an issue.
Additionally, BoatUS told me that losses basically follow the owner, not the vessel. So, the owner who let the boat sink would see a big premium change for years -- even for a brand new replacement vessel. But the boat, once repaired, was not a specific concern.
State Farm told me basically the same thing about boats, but we didn't talk about owners. I forget the details of my third call, but it was more of the same.
There is no harm in asking an insurance agent -- they don't set your rates -- and will gladly help you. At least that is my experience.
In this case, if you call a few experienced marine insurers, I think you'll consistently get the same answer as I did and feel good about it. I think the reality is that all older boats have histories, known or unknown, and that is, to some extent, mitigated by a survey, and to some extent, priced in. But, that insurance companies aren't making decisions about what N-owners-ago might or might not have disclosed and has or has not been passed along since.