Yes, I got scammed on Ebay selling camera equipment. The con artists send emails that look like they are from PayPal so I sent the product. If I would have just signed into Paypal and seen the funds not there, I could have had more time to flush out the scam.
Fed Ex managed to retrieve the overnighted packaged and the lens but its rare.
Ebay was quick to notify me of the scam and give me time to react.
trust your instincts, too.