So a bit of curious research yields that in the absence of a specific state statute common law prevails. That is, if and whenever the "true owner" can be established you need to give it back.
NH does not apparently have a state statute.
For reference, the Vermont law can be read:
EZ-Dock modular docks
Canoe / Kayak Anchors
Kayak Deck Gear Bags
|Table of Contents|