Just a word of caution: If you allow a non-customer to purchase (with cash b/t $3,000 and $10,000) a negotiable instrument on behalf of his/her business/employer, etc., you'll need to maintain that record and scrub the purchaser against 314(a) requests for six months following the transaction. We don't sell negotiable instruments to non-customers, but some tellers mistakenly thought it was okay for a non-customer to purchase on behalf of a customer. We got our hands slapped for not including the non-customers in our 314(a) searches. We figured out a way to add their profiles to CIS without dropping off because no account was attached, but it was a pain. Needless to say, much more training and reinforcement on Bank policy has (so far) eliminated the problem.
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Nothing difficult is ever easy.