keep in mind if M&N files a claim and you didnt select signature confirmation you arent gonna get your money back.
Fedex will most likely deny your claim
Im just letting you know how it goes with M&N, i had a similar issue.
If they talk to the driver and he says it was delivered its your word against his. You can tell M&N what happen and all they will do is file a claim with Fedex, if they approve the claim you get a refund, if its denied then you get nothing.
98% sure Fedex will deny the claim unless the driver is shady but if he was then why would he still be working their? anyways best of luck. hopefully it got delivered to wrong addess or your neighbor.