I'm all about pissing off the neighbors, but don't waste your time with the code guy. You just got a "notice", no fine. The code people are just low-budget stiffs. If you really want to play the game, call and tell him you've complied. Make him your friend, don't make him do more work.
And if the boat has been there this long, I doubt it was a neighbor; they probably don't want anyone snooping around anymore than you do. I'm going to 2nd the guess that it was the realtor/home for sale owner that complained. If they're that much of a shmuck, do what you can to help the house sell and get them the phuck out of the 'hood.
I've gotten so many notices and warnings I've lost count. My neighbor called to bust on a house next door. Code came out and when they were done with them, they looked around and left me a nasty-gram on my little 5x8 utility trailer. Pissed me off at first but was glad to have the other place busted on. since then, nobody's ever complained about my 24' enclosed car hauler sitting in the driveway for a couple days at a time or when I bring the boat to the house on the weekends.
Make friends not enemies and don't sweat the small stuff