A logical scan is one that's implied by the container. So the shipper gives the package to UPS, UPS puts it on a trailer or in an air freight container. Wherever that container goes, until it's opened up, so should everything in it. They don't scan everything in the container at each step, because that would waste lots of time. They assume that everything that was on the trailer when they left Hooverville is still there when they get to Coolidgeburgh. So if your package isn't on the trailer to Coolidgeburgh, it'll show as having arrived there, but since it's not really there, it won't get sorted into the delivery truck, or the truck going to the next hop. Eventually, the package is going to get somewhere where it'll be scanned,[1] and it may look like it teleported from Coolidgeburg to Pierceville.

All the package delivery companies do this to some extent.

[1] unless, of course, it's really lost. In which case, well, maybe they'll look for it.