Check with your state. Being documented will have nothing to do with whether you owe them use taxes. USCG documentation is your form of title only, as opposed to a state title. Many, if not most, states require you register with them anyway if you keep the boat there. If you are documented, you don't need to display state registration numbers.
It seems like you bought the boat out of state. If so, most states also give you credit for sales taxes you paid elsewhere against the use taxes you might owe them. If there were a small balance due, it would make much more sense to pay it than run up the penalties too. Eventually, an inspector shows up at your marina and takes down names. In some states, the marinas themselves are required to list any vessel on their premises for more than a period of time.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.