I bought a Lego set from a seller in the local area who listed the set as new, I paid...

I bought a Lego set from a seller in the local area who listed the set as new, I paid the seller $** in person, and box was in nice shape and sealed, but after further inspection at home, the seals were broken, and reasealed. I have not opened the box to see if it even has the correct piece count of *** pieces, but even in the best scenario & it does,this is complete misrepresentation, because it is not new, and unopened. Of course if the box is full of something else it's a complete scam, and monetary loss. I have sent the seller a message about meeting him getting a full refund of the still sealed box that he gave me. I had numerous communications with him here on Offer Up, but can't really find his profile which was labeled Jeremy (**) in Pompano Beach, Florida. If this seller doesn't even respond to my request, which he will probably not since he's a scammer, I think Offer Up should locate his account & email, and remove him from the website permanently. Please let me know if I have any recourse under the circumstances, even if I get no response and finally decide to open box, to find sealed complete bags in *** piece count set. Any help appreciated, ***-***-****, Rolando. Thank You!