Upon expiration of the 90-day period identified in N.H. Rev. Stat. § 270-B:5, the director of state police may dispose of any unredeemed boat by destroying such boat or by offering such boat for sale at public auction or the director may retain such boat for use by the state; provided, however, that if the boat is sold or retained, the purchaser or the state, in the event of retention, shall pay the cost of impoundment, removal, and storage, and shall obtain release of the lien described in N.H. Rev. Stat. § 270-B:3. Any money received by reason of sale of such abandoned boat at public auction shall be deposited in the state general fund.