Legal Question in Consumer Law in Illinois

Re: ebay item shiped , buyer threatens to sue me

Ever since people began doing business by mail, this has been a recurring dispute. The fact that the transaction was made over eBay doesn't change the general rules. UNLESS there's something in the eBay rules or any specific agreement between buyer and seller to the contrary. That could change everything. I don't know anything about eBay rules.

The general rules are that: delivery is complete upon mailing, and proof of mailing creates a presumption of receipt. (The Post Office is, in fact, at least 99.9% reliable, and any other presumption would make it impossible to do business, if every routine transaction and notice had to use certified mail).

So the question is, do you have proof of mailing? Your word is some proof. If the clerk at the post office remembers taking the parcel, that would be proof. But the best proof would be a receipt from the Post Office. And here's the lesson:

The Post Office has a form to provide proof of mailing, even for regular mail. It costs nothing, and if you had gotten one, you wouldn't have any problem.

As things stand, it's your word against his. He can sue you, probably not in Illinois, and the outcome would depend on whether or not the judge believes you.