I have had shipments that were late, but not that late. I didn't understand why they weren't being tracked either. Some had tracking numbers but according to the P.O. they don't scan priority mail except when they accept the package and when they deliver it, not in between. Well, what the heck good does that do???
Also twice now I have had shipments from Texas to Michigan arrive in one day, but shipments from Ohio to Michigan took 3 days! WHAT??? According to the main shipping dock in Lansing, long distance packages are put on a plane so often arrive faster. Closer boxes are shipped by truck and only "certain" trucks will take live animals, so they sit there until the next truck arrives that will take them. Isn't that stupid???
I think it is a shame MM was not concerned and was rude, but think the fault here lies with the USPS. MM shipped their chicks like they were all shipped. On one hatchery's site (can't remember which one) it mentioned no longer shipping express, even if requested, because they had actually had more problems than with priority. Go figure!