Unless for some reason you are aware that they are in a flood zone, no action is necessary. The purchase is not a trigger:
From the Q & A:
2. Does the Regulation apply loans purchased from others?
Answer: No. The Regulation lists certain events that trigger its requirements: making, increasing, extending or renewing a designated loan. The purchase of a loan is not an event that requires a purchaser to make a new determination at the time of purchase. However, if the lender becomes aware at some point during the life of the loan that flood insurance is required, then the lender must comply with the Regulation. Similarly, if the lender extends, increases or renews the loan, the Regulation applies.
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