Quote Quoting Minnesota Statutes, Sec. 345.75. Abandoned Tangible Personal Property.
The ownership of abandoned tangible personal property that is not subject to any other provision of statute may be transferred as provided by this section.


If property has not been removed within six months after it comes into the possession of a person, it is abandoned and shall become the property of the person in possession, after notice to the prior owner. Thirty days' notice that the time period has elapsed and that the ownership will be transferred at the end of the 30 days shall be given to the prior owner personally or by certified mail, which is actually received. If the name of the prior owner is not known, and cannot be ascertained with reasonable diligence, three weeks' published notice shall be given in the county where the property is located. The prior owner or another person claiming an interest in the property may petition the district court to stay the transfer of ownership for a reasonable period to allow the removal of the property. The transfer is stayed while the petition is pending before the court.
I expect that the problem with trying to argue that you had a right to sell under that statute is that the property was subject to statutes governing the distribution of property in divorce and was also subject to the divorce judgment. Also, unless your judgment allowed you to impose restrictions on your ex's removal of the property, you have no basis to impose hurdles upon him and then to use his inability to meet your additional demands as a basis to claim ownership of the property you won't allow him to remove per the judgment. If you're lucky he won't take you back to court and this won't be an issue. Otherwise, it sounds like he has some plausible arguments that you owe him the property or its fair market value.