I noticed in the emails from the purported customer there is a lot of bad grammar, or at least weird grammar. That is usually a hallmark of a scammer. Usually b/c they are run by people for whom English is not their first language (e.g., the Nigerian scams). Almost without exception, there is strange syntax, tenses, word usage, etc. Misspellings also, but that alone wont necessarily raise flags. I am an excellent speller, but atrocious typist.
I still say this is a scam. Maybe someone fishing for prices. But with the money order, it was either going to be that scam to get you to refund that money, or the shipping. In the money order scam, the MO is fake but your bank doesn't figure this out for about 2 weeks. By that time, they are long gone with the cash refund from you. If it was the shipping scheme, I think at some point delivery would have been changed to using a company, not in person.
I definitely still think this is a scam. And the more the word gets out about ALL scams, the better.