$327 doesn't go very far, especially at a C-store. I think the response is credible. More so, even, given that you haven't come across anyone else who appears to be running checks more than $1,000 through the store.
Unless there's a state licensing requirement involved, I think you're fine. Registration is required for a check casher if it "accepts checks (as defined in the Uniform Commercial Code), or monetary instruments (as defined at ยง 1010.100(dd)(1)(ii), (iii), (iv), and (v)) in return for currency or a combination of currency and other monetary instruments or other instruments, in an amount greater than $1,000 for any person on any day in one or more transactions."
In other words, if the C-store pays her back $1000 or less in any one day, it's not an MSB.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8