There are a bunch of whiny man-children in this thread.
Non-vaccinated old and sick people afraid to leave the house are waiting for medicine, life supporting stuff, and you're whining about oil samples getting delayed.
The USPS is hobbled by
-- Louis DeJoy, who has a financial interest in the competition. He was put in power by the previous administration and the current one is working to get him out. His "reforms" were mostly smashing perfectly good sorting machines.
-- a manpower shortage, caused by the need to pre-fund every new hire's pension for a ridiculous amount of time. Said requirement is not made of other (quasi) government agencies or private industries. Again, the motivation behind this is a hope that the USPS will fail. This prefunded pension is a giant slush fund that coincidentally exists to make the national debt look smaller so rich guys can be taxed less.
A post office is infrastructure, meant to help a 1st world country trade and communicate amongst itself. It's not meant to be a profit center, it's a public service. It's as important as roads, electricity, and internet. I hope those working to make it better, succeed. As to the stuff I order online, I respect that it's got the lowest priority behind all the medications and whatnot.