We sell and ship a lot of trains, all by USPS. We had many packages get "stuck" from late November into early December. Tracking just stopped, as they were nowhere. We had to issue many refunds to buyers, and made claims to the PO, which they paid. However, most packages have finally moved, most have finally been delivered. Understanding buyers have re-paid invoices and we have returned many checks to our Postmaster. Due to Covid, understaffing, increased internet buying, political disruptions etc, the Post Office redirected huge amounts of packages to different destinations, warehouses and some just sat in semis. There was no tracking on these items for as long as a month, until they were dug-out and finally sent on their way.
Hopefully the PO will be able to anticipate holiday increases in 2021 and we will not have this problem again. As most of the issues were resolved, the main loss is in wasted time, and expense to the PO of processing refunds. We will never know how much business that we lost, because of buyer's fear of not getting their items.