Been there...done that...got the kick in the teeth for being helpful.

Experience never comes cheap...

Count yourself lucky....for a small price of admission, you just
learned more about your neighbor than you likely wanted to know. I can
guarantee you that the experience just saved you from getting into
something really serious with the neighbor down the road and paying a
much larger price.

And you are right about not telling anyone that you do
Ebay....neighbors, friends and family may turn you over to the IRS for
their cut of the unreported income....happens all the time.

TMT