Is this right...?

I recently sold a used Honda CR250 to guy. it ran good and everything he bought it in cash no big deal. I gave him the registration and papers for the bike which he didn't really look at that well, he basically just threw them in his truck and we loaded the bike up for him. we chatted a bit before he left, he told me he was going to take the bike riding that weekend and then he was going on a vaction for a week after that.

About 10 days later, i got a text from him saying he needed a bill of sale to go along with the registration because after he looked at the registration closer, he found it had not been signed over correctly from the previous sellers. I tell him no big deal and I would get a bill of sale wrote up. He came by later that day. I gave him the bill of sale, he read it and then declined to sign off on it.

At that point he lifts up his shirt and shows me a badge and says hes an off-duty cop. He goes into this story about how it is required for him to have every auto, bike, toy, etc. registered with the state but he can't register the bike because of the problems with the registration and he is worried it might be stolen, even though the registration papers match the bike. I 100% know the bike is not stolen and I bought it through a legit transaction. I offer to get the title straightened out or offered to apply for a bonded title for the bike because i'm thinking he wants to keep the bike since he got it at a pretty good price. He says no to all that and says he just wants to return it for his money back. Starting to get kind of pissy with him, I just told him yea whatever just to bring it back and ill refund his money and i'll get the title straightened out myself.

Well all this started in early september. it seems everytime i set up a time with him to return the bike he makes an excuse why he can't come and keeps re-scheduling. It seems he's just jerking me around because he's a cop and might think he has something since the registration was not signed correctly. I have a gut feeling he's just been riding the bike and is going to return it when the cold weather comes here soon. I guess it's partially my fault because I did not look at the papers close enough before I sent him off with it, but i feel like the way he's dragging this whole deal out is not right. If it was within a cuple days after the transaction he made a return...yea no big deal. But it sucks because I had already used the money from the bike sale to buy materials to finish off my garage (the only reason i sold the bike in the first place) so I had to do some begging and borrowing to get his return money and now it's just sitting.