How can I stop this scam mail or report them?

Get this fake beermoney assignment in a Usps flat rate envelope.

A fake check for $2,400 Talking about being a secret shopper etc.

Obviously fake. This is the second I have received. How can I report?

https://i.imgur.com/5T3vrQw.jpg

submitted by /u/DankestTaco
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source https://www.reddit.com/r/beermoney/comments/peu138/how_can_i_stop_this_scam_mail_or_report_them/