The question of security is, of course, important. You don't want checks you have scanned to be used a second time and creating a duplicated presentment against your or any other bank's accounts. Accordingly, actual retention of the physical checks should be for the shortest reasonable period to allow for replacement of faulty images, etc.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8