As long as you open a return through Ebay, the seller will have to provide a tracked label to get the item back and will then have to refund you in full.
You also have the chance to leave feedback to warn other potential buyers.
"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)