You can't report a buyer for 'possibly trying to scam'.
You give very little information.
If the buyer has opened a return, you should accept the return, provide a label and get the item back.
if you don't receive the item back which you sent, come back then for more advice,
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)