You are not obligated to pay for it or send it back. If you didn't order it you may keep it for free. The Postal Service says it is illegal to send you something you did not order and ask for payment. this is the link to the information on their website.
https://postalinspectors.uspis.gov/investigations/MailFraud/fraudschemes/othertypes/UnsolicitedFraud.aspx]
https://postalinspectors.uspis.gov/i...itedFraud.aspx[/url]