[moftz]

When you drop off a package at the post office, you can either wait in line for an agent at the counter to scan your package (only during business hours) and give you a receipt or you can place them in a drop box (open 24/7). The drop box usually has a last pickup time on the label (3pm, 5pm, etc) for when someone actually collects the contents and then scan in the packages to get them into the sorting/tracking system. The problem is that sometimes these bins of packages might sit for a while until someone scans them for the first time. There is a bin behind the wall for the drop box and if it gets full, they pull up a new bin for the drop box so there could be multiple bins of packages that need to be scanned.

You would need to search the tracking number and see when the first scan occurs. Shippo is only looking at shipping label creation date which could be offset quite some time from when the package gets scanned. Large businesses might have enough employees to where they can pack, label, and ship out an order that day but small businesses might have someone hand delivering packages to the post office every other day.