"If the lien holder asks for his property back that is somehow evidence he has no valid lien? How does that make sense? What? "
As with most in this discussion, you confuse a lien and ownership. It is not "his property". I can ask you for a million dollars, and if you willingly give it to me. I now have a million dollars, Thank you, very much, and good luck getting it back. If I say that you owe me a million dollars and you willingly give it to me. I "might" have committed a crime, but good luck getting it back. If I get the million dollars against your will or forceably, call 911 and file a police report, a crime has been committed.
If the equipment was leased and not a lien, then the seller sold property that he did not own and committed a crime. Force the legal system to get involved. Try walking into a pawn shop and walking out with your stolen chainsaw even with a police report with serial number.