following hurricane Katrine, when half of Louisiana seemed to have moved, we were recieving over 6,000 return envelopes per day! We would flag each customer in our Fidelity system so that if they came in to a branch to make a deposit, we would ask for their new address. This caught only a small amount, and we finally subscribed to a system the post office had where they would attempt to forward if they had a new address on file. it was not cheap, I think it was $.75 for each forward. Took us about 1 1/2 years to clean this mess up.
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