How long does a bank keep a certified check on file?

my dad got a certified check about 13 years ago to help my sister buy some land........NOW her husband is trying to say dad didn't help them..we have look everywhere but cant find a copy of it i was just wondering how long the bank would have a copy of the check.. i will call the bank were he got the check monday and find out for sure but i was just wondering...THANKS

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