You just said that you're certain that the eBay transaction is a scam.
"I have no fear that..." = You are certain of something.
e.g.:
"I have no fear that HLJ will deliver." = I am certain that HLJ will deliver
"I have no fear that the result of our experiment will be that men may be trusted to govern themselves without a master." (Thomas Jefferson)
= Jefferson was certain of the result of his experiment
So, "I have no fear it's an eBay scam" = "I am certain that it is an eBay scam"
You should file a report if you have been scammed.