Thank you for sharing this. I live in metro Detroit and haven't yet received our USPS test kits. Given the frigid temperatures, DH runs out to the mailbox the minute we see the mailman stop at our box. I've read/heard that the test kits do not fare well in cold temperatures, so we want to get them indoors asap. That said, our mail probably sits on post office vehicle for several hours prior to delivery. I hope they've figured out some way to protect the government-issued test kits. Of course, we hope we don't ever have to use them, but will be glad to have them on hand, just in case.
I was thinking the same thing about how long the test kits are sitting in trucks, including the USPS trucks. A few days ago, @Jersey girl posted an article here on the impact of cold weather on the tests and which tests might be more vulnerable to the freezing temperatures. I'll see if I can find it and bring it forward.
Also, if you sign up for "Informed Delivery" at the USPS site, every day you get an email with a list of items that will be delivered that day, with letters scanned to see what letters you will receive, and packages (not scanned but some notation about where the packages are from). It only takes a few minutes to sign up. I don't open them on a daily basis as I already receive too many daily emails, but when I am expecting something important I often check these delivery notices. I was watching for this one.