Yes,they will try to take the funds back from you.
Tracking #'s FTW.
I almost learned the hard way once,someone tried to make that claim 1 day after the auction ended :bloated: and paypal tried to give them their money back on a $1400 laptop I sold.Too bad he tried that shit before I sent it out and I noticed it right away because I not only had his $1400 but I had my laptop too (closed my bank account out before they could take the funds back).I kept the money in my account and about a month later paypal asked for it back because the guy was using a stolen credit card.
Worst ebay experience ever.