There is a scam whereby someone orders items using stolen cards and has the items delivered to an address they have access to - could be a friend or relative of the home owner, gardner or cleaner etc or just someone who lives nearby who will knock and claim it was meant for them. It could be a gift, or a scam, and you could cover yourself by reporting it to the police, who will probably not be interested and tell you to keep it. If unclaimed after a certain time it is yours (as with cash found). At least if you do this and the item was paid for with a stolen card you should be in the clear. Meanwhile if anyone comes to claim it you should ask for proof of identity before parting with the parcel.
I hope it turns out to be a gift for you.
It could be a hoax, like the You've been framed program, to see how you react!