I had beans for dinner. Should I worry??
USPS has a newer feature called Informed Delivery. Mail is photographed and the image is sent to you. It can also alert you to packages, so the tech is there to “watch” your mail. The post office has more knowledge about what is being handled than we are aware - I assume they know when they did not handle a package.
https://informeddelivery.usps.com/box/pages/intro/start.action