With things going on with the mail right now, it's possible it's been mailed and he isn't responding because he feels you aren't giving it enough time. Has he logged in and ignored you? I don't recall seeing that in the thread. That's pretty important because if he hasn't logged in there's a very high chance he hasn't seen your messages. We really have no idea what's going on with people who aren't close relatives. While he Should tell you if it's mailed or not, we have seen people in the past who didn't even know how to check their messages.
I'd give it some more time. If you don't hear or receive anything by Valentine's day then I'd start to get worried.
As sad as it is to think about, we also have to keep in mind that he may have gotten covid and died. I personally know three people in the Hudson Valley who have had that happen in 2021.
Personally, I'm waiting for an eBay purchase that was due to arrive by January 12th and a Facebook group purchase that predated that, neither of which has shown up yet but both provided tracking numbers.
Hope it works out for you.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):