I had a signed blank check in my bag (meant to be given to someone) and I lost my bag. I had forgotten about the checks when I lost the bag otherwise I would have cancelled them. Now I checked my statement and someone used that check to withdraw $5000 from my account. I don't know what to do at this point. My bank (citibank) tells me they cannot cancel it now since it has already been withdrawn. Could someone please shed some light on this - what can I do to get my money back as that money was meant for my son?