In this apparently excellent answer it is implied/stated that "closed loop gift cards", such as amazon gift cards are "stored value" such that issuers of more than $1,000 per person per day of them would be considered a money services business (MSB) and must be appropriately registered and must follow certain rules, in particular Know your Customer.
It seems to me that closed loop gift cards are functionally identical to store credit that is frequently given for returned purchases, and also personal IOUs would seem to have very similar properties. While I have never given anyone an IOU for more than $1000 I bet someone has. I would be surprised if many shops do not approach or exceed the $1000 threshold on busy days.
Do the MSB specification of "stored value" include IOUs and store credit? If not, how is stored value defined?