For starters I'm sorry to hear of your loss Peter.
I once took a look at that 'Sand Hole' on Lloyd Neck on a falling tide and said forget it. I could see a submerged rock jetty.
As to the issue of who owns it now I'd guess it belonged to your insurance company, unless they sold it to Seawanakah. I have no idea what a snooty club like that would want with your 'derelict' boat when their members have Hinkley's, Swann's and top tier boats like that. I'd bet that your insurance co. is just keeping your boat there temporarily until they can make arrangements to either part it out and/or chop it up into a dumpster. Big headache for them so why would Seawanakah want that responsibility? I dunno. Maybe they think the engine is worth salvaging and they need a backup engine for their 2nd launch?
My current boat was 'totaled' (CTL) by Boat US about 9 years ago when it chafed it's mooring during a bad blow in the westernmost LI Sound. Damages were: small hole in hull deck joint (3"x12"), bent bow pulpit, shredded genoa, bent RF extrusions - that was it. We bought the boat back from Boat US for $800 and received a check for our insured amount minus $800. We repaired our boat with the money from Boat US. We could not get insurance the next year either (as previously noted by another poster). One of the first questions on any marine policy is have you had a CTL in the last 3 years? (Red Flag, Red Flag, Red Flag).
The hull is repairable judging by the photos. Sounds like the interior needs a good gutting and cleaning. Hopefully the engine is not toast - quick action on this front might save it. The thing is you (whoever wants to try to rescue this boat) are going to need to find a boat yard that will let you do the needed work yourself and of course you will have to pay for the storage fees (possibly to Seawanakah too).
I'd contact the insurance company first as Peter Brennan is not kidding that Seawanakah is one of the last Blue Blooded yacht clubs around (besides NYYC).
You need to know which insurer Peter used (BoatUS, Allstate etc.). If you can speak to the right person at the Insurer they may be happy to sell you the boat for very little as they likely have to pay a lot more to haul it away to a dumpster.
I'm curious about the status of the engine. Which engine was it? How badly flooded? Putting a new engine in a boat that size could cost quite a bit. Scraping some crap off the cabin walls, while not pleasant sounding, should be fairly easy with a pressure washer.
Still going to cost you a bunch to clean up and fix.
Good luck.