Ideally, if you wish to sell them to customers (but many customers, especially corporations, send someone to act as agent for the purchase), your policy should allow for the sale to a customer/remitter even when the agent is not a customer.
Also ideally, your spreadsheet can account for both situations by including a purchaser column (the individual making the purchase) and a remitter column (the person named as remitter on the check). Just remember, though, that the record keeping rule is that you collect and retain info on the purchaser, and that's also the information you use in doing your 314a searches.
_________________________
John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8