There are 5 activities that make a customer an MSB (not all require registration), but one is acting as a seller of checks:
(4) Seller or redeemer of traveler's checks, money orders, or stored value. A seller or redeemer of traveler's checks, money orders, or stored value (other than a person who does not sell such checks or money orders or stored value in an amount greater than $1,000 in currency or monetary or other instruments to or redeem such instruments for an amount greater than $1,000 in currency or monetary or other instruments from, any person on any day in one or more transactions).
However, if they sell as a agent for a registered MSB they are not required to register themselves.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.