No, because the federal government, including the post office, has sovereign immunity from lawsuits. There is the Federal Tort Claims Act that carves out some exceptions but I think is silent on the Post Office. Here is an article from the claims journal: https://www.claimsjournal.com/columns/road-to-recovery/2020/...

I once worked on a case where the client was hit by a bus operated by the County (so a local government in a particular state), the suit was not entirely barred but there was a cap on damages which would not otherwise exist if say it were a bus being operated by a private company (which would of course generally have a commercial insurance policy as well). It has been almost 10 years but at the time I think the cap was $200,000. Interestingly there is/was a mechanism to request the state (I think the state legislature) waive the damages cap on a case by case basis, but unless your firm was politically connected and donated to political campaigns good luck with that.

Post Office has no knowledge of what's inside the box, whereas Amazon not only knows it but often is the one that puts things in that box.

Last year we had issues where medications didn't arrive on time or were outright lost. Or farmers complained that chickens that were shipped arrived dead due to DeJoy's efforts to "improve" USPS.

So I would imagine that yes, you could.

> I can sue the Post Office for delivering a bad product to me?

Strange question, in USA, the is fact you can sue anyone for anything in a civil suit. It's up to a court to decide whether your case has merit or not.