Oh man, me too... I mailed some stuff I machined to @
cudak888 without tracking (just using postage stamps), and it never got there. I machined the parts again and mailed them with tracking and they were there within a couple days! Just goes to show.. Completely random I guess.
It seems to be international too, probably due to covid insanity. I had a headset shipped from France, but the tracking info said the package was never given to the mailman - in France! Still not sure if the seller was a shyster or what, but the tracking hasn't budged in three months. Evilbay gave me my money back, the seller offered some paltry explanation, and that's that I guess.