Every tax return in my office goes out Priority Mail with Tracking. The label prints out stating 1-day, 2-day, or 3-day delivery.  I also get a report of when delivered.  Average delivery time for 2021 is 9.75 days with a lot of my mail going to the same zip code or the zip code next to me.

Had some packages take months.  Had some packages mailed back to me as if I was the recipient. Complained to the Post Office. Complained to the Postmaster General. A few years ago never received mailed for 3 weeks straight during tax season.  Took that one to my Senator.  Bottom line, no one cares and no one did anything. Wish I had a lifetime pension for doing lousy work.  And prices are going up again August 29th and there will be a surcharge during this holiday season.