I had a package from Pinball Life lost in USPS limbo a while back... was shipped on pretty much the last day before they stopped using USPS as a carrier.
Now I have a set of mirror blades from Cointaker stuck in "In Transit, Arriving Late" hell... it only made it one hop from the mailing source before getting stuck. It's only been a few days, though, so perhaps there is hope for this one yet...
My personal experience was that USPS actually got BETTER at the very beginning of the COVID stuff... I was getting packages a day earlier than originally forecast. A few weeks into the crisis, though, and all that changed, and bad things started happening. Now most everything seems to be at least a day or two later than originally predicted, and a lot of times things are outright lost.