Published: Jul 28, 2011 2:37 AM EDT
Updated: Jul 28, 2011 1:42 AM EDT

BUCKINGHAM, Fla.-  Donna Shankin was trying to sell her condo on Craigslist. 

When she got a buyer, she brought the cashier's check down to the bank. But the check was for about a thousand dollars more than the asking price. 

She thought it was a scam when the buyer asked her to wire money back to her because her accountant made a mistake. Shankin refused, saying she'd only send it back when the bank told her it was a good check. 

A day later, the bank gave her the green light, and she wired the money back. 

Five days later, the bank told her it was fraudulent. Shankin wants to share her story to make sure this doesn't happen to anyone else. 

If you are dealing with cashier's checks, experts say wait three weeks until they clear if you think you are being scammed. That;s how long it could take before the bank realizes it's a scam.