Thanks for the input...
It was a street address.
The customer knows the status of the delivery confirmation info; she actually forwarded it to me with a message that basically said "I don't understand, I never received the box."
It's a good idea to have her ask the mail carrier whether they remember dropping it off...
Something about the whole situation gives me a bit of a red flag, although I can't quite put my finger on it.
I'll keep you all posted if anything goes horribly awry.
Roxi