Things have been quite weird at the post office lately. I've had packages stay in places for days then arrive quickly thereafter. Seems there are some locations that have more trouble than others. Where I'm located when anything reaches Hazelwood, Missouri I start praying. I've had packages stay there for over a week and packages have arrived sans contents. Lately Indianapolis has been having some issues getting things out as well.
The crazy thing is, I won another coin from the same seller and it already made it here. About 3 days ago. It was actually here in about 4 days.
Compare the writing on both packages when and if you can. There may be something that explains why this occurred.
I ordered 4 NGC coins 3 days ago, three of them from the same vendor within a half an hour of each other. I got 1 of them the next day and I am still waiting for the other 3. My grandfather was a Mail Carrier in Indianapolis and then in L.A. If someone was missing a package, he would physically find out what happened. That was a long, long time ago. He delivered the mail on foot carrying that huge bag. He physically sorted the mail in order of the houses on his route. If he had miss-sorted a letter, he would take it back to where it was supposed to go. He died about 20 years ago and almost every person on his route went to his funeral.