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100% correct. A Delivery Confirmation number is just that. It's meant to confirm delivery, not as a tracking number, even though often you do get tracking information via the DC number.
They are supposed to be scanned at mail processing centers but aren't always. I'm astonished at the number of people here saying they never get updates, also. If the package is indeed shipped AT THE POST OFFICE, I always get updates. Many businesses, however, give them to UPS to handle. You will then rarely see anything on the Post Office tracking until the day it's delivered because the post office doesn't physically have the package, though you get a really cheap shipping rate. UPS tends to take their sweet time getting the package to your post office. Once there, it is delivered that very day.
Express mail would be the way to go with eggs or chicks anyway. Otherwise you're not guaranteed any particular delivery date, either. They usually arrive on time, but if they don't, with Priority, you have no recourse.
I worked for a year at a large regional mail processing center monitoring this stuff and helping troubleshoot problems with the system. Of course, I had no control over anything, I could only record, report findings, and make suggestions. But even before I did that, I tried my best to get everything shipped via the US Mail because I have consistently gotten better service that way at my house. There are some centers that are very lax, but most are not. Anyway, in December they are WAY overloaded so yes, bad time to ship anyway.