The board may acquire former wetlands and associated upland habitat, restore those areas, and sell the lands, or any interest therein, to private owners, local governmental agencies, and state departments and agencies or exchange them for other land, if an agreement is secured to keep and maintain the lands as wetlands in perpetuity. The agreement shall contain a reversion if the lands sold or exchanged are not maintained as wetlands. The agreement containing the reversion shall be set forth in any conveyance transferring any land, interest in land, or option subject to this section. Proceeds from the sales or exchanges shall be deposited in the fund.