seller is not the owner?

[Jimmy S.]

So a piece of land hit the mls at a good price. My agent called and got the scoop. Put in a offer and it was accepted all within 24hrs. The listing agent came back and said it was a scam and they in fact dont own the property. Seller never signed my offer but was verbally acccpeted. The contract for the seller to put it on the mls was signed but was a scam. (guess they docu signed it) Any one run into this before? How did the listing agent not meet with the seller or verify they are the owner before putting it on the mls?  I never ran into this before and been in real estate for about 12 years buying and selling.