FedEx complaint: Put up two reject delivery signs for package at both front doors and fed ex carrier put package in my mail box which is illegal.

My complaint:

Shipper told me to reject delivery of package if I wanted a refund. I put up very visible signs rejecting delivery at both front doors and Fed Ex carrier illegally put package in my USPS mail box

Suggested solution:

Fed Ex should come and pick my package up and return it to the shippet.