The Night Drop box covers the fact that you did not identify a transactor. Multiple transactions in section b would be used if there was an in person deposit where the transactor was not identified (ie. one of the deposits is below the threshold for you system to trigger identifying the transactor, or you aggregate transactions and find a CTR needs to be done, but do not know who did one or more of the transactions.)
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CAMS, AMLP, AKC, K-9