I got fired for fraud returns for myself and others. I was called in to write a statement with no police around. I was told I would receieve a letter

It depends on what t you admitted to when you wrote the statement. You could be prosecuted but it is possible that it will be handled civilly with restitution. I t is extremely wise for you to be prepared to pay back the loss ($1000) immediately if you get the opportunity. This may not be possible but it would be much less expensive than having to pay it back and still have court fines, court costs, probation fees, attorney fees and a criminal probation and possibly a criminal record.