Thinkpad X1 tablet Gen 1 WiFi issue

[babblefish]

I just bought a NOS Thinkpad X1 gen 1 tablet still in it's sealed factory box. I replaced the main battery and the CMOS battery which were both dead. It has Windows 10 installed. Runs great except for a small issue with the WiFi. It sees a bunch of WiFi signals in my area except for mine. It doesn't even show my SSID. My router is using WPA2 security and WiFi 5 (802.11ac) on the 5 Ghz band. My T60, X61, and X230 all connect and work fine. If I turn on my smartphone's hotspot, it sees and connects to that. It also connects to the WiFi at my local coffee shop.

Does anyone know what's going on?
Can the WiFi card in the tablet be changed to a more current one?