We need a little more clarification on 'short sale has expired' before we can answer this question accurately. Do you mean the listing has expired? Do you mean you had both the sellers and the seller's lenders approval of the short sale and the closing date has passed?
Did it give a date on the Contract?
Was the Contract APPROVED/ACCEPTED by the Bank?
You understand that that is necessary?
That the HOMEOWNER needs the acceptance of the Bank?
Did you read the Contract?
Do you have a Realtor representing you?
It sounds like the answer to all of these is, NO!