If you receive an email out of the blue from someone you don’t know, and it offers something of value for free, be extremely wary. More likely than not, the offer is a scam.
For more information on these types of scams, see this article from Brown University’s Phish Bowl Alerts. The scammers seem to try to defraud their victims by charging them a fee to move the piano, but it never arrives. Being told to pay to receive an item sight unseen is another sign it’s a scam.