Sorry I haven't posted anything new on this. I've been working 12-14 hour days and haven't had a chance to spend much time on the computer.
The situation is still up in the air. I think they will probably work out some settlement, but it will cost my friend money. His great deal isn't great anymore. Instead he will probably end up paying (between what he paid the seller and what he's going to pay deere) more than a new tractor would have cost new.
Another thing that came up is that the seller lied about his address. Again this was all done over the phone, and he had his money wired to his bank. The address he provided was across the county line, so that if a title search had been performed, the lien would not have appeared. Deere provided a copy of the filed UCC statement, and it was filed in the adjacent county. I don't believe they filed it with the state.
Before I mentioned you needed to search for liens (both county and state) and run the serial number past a dealer to make sure their system does not show it was stolen. I think you also need to see if the dealer can tell you the address the original owner gave the finance company so that you make sure you search the right county.
As to "bona fide purchaser" rules, that requires that you be a bona fide purchaser without knowledge of the lien. The whole reason people file liens, deeds, mortgages, etc. with the county or state is that this is constructive knowledge. i.e. everyone is deemed to know about the filed records. The burden is place on the individual to perform a diligent search of these public records. The practical problem is where and how to do this search.
I'll let you know more as it unfolds.
Again, if it sounds to good to be true, it probably is.