You should consult an experienced labor and employment attorney and allow him/her to advise you.
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Use the FIND A LAWYER tab on this site and cosnult with an employment law or business law attorney. It would be in your best interest to see what you need do to protect yourself in this situation, given that the employer has accused you of theft.
Rengin Bekhtyar's answer to a legal question on Avvo does not establish an attorney-client relationship.