Just to be safe, call Amazon and give them the shipping tracking number to determine who bought it.
Something similar happened to me and it turned out to be a scam. Someone setup another Amazon account as me, with my stolen credit card info and address, but not my email. They then bought something from a third-party seller at a massively inflated price and the fraud detection was zero because they shipped the product to my address - the same address as the credit card billing address.
In this scam, they make the money by the inflated price, not by receiving the product...and they used a stolen identify to setup as a vendor as well...so some poor sap gets fucked on that end even worse due to taxes. Took awhile to get fixed.
Hopefully that's not it, but better safe than sorry.