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If you wanted a copy of the check you had to make a copy of that check before you cashed it. Once the check is signed over to the third party and they cash the check the only way to get a copy of the check is ask the person who actually issued the check if they can get a copy from their bank for you. If they refuse to get a copy of the check from their bank for you, there is no statutory right to demand the check and the copy would only be obtained by you getting a subpoena as part of some lawsuit.
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