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Hey wait a gosh dang minute what is going on in here
The two holes are buttons and it looks as if two of the traces from the RJ-45 go into a transformer! There's also an unused header.

TRI-COLOR FOAMING WAX

if you can't tell that's being typed on the Ross keyboard and I love the feel of this thing. yes. After blowing through an embarassing number of RJ45 plugs (well only four) I got the pinout!

3. VBUS
4. GND
6. D+
7. D-

I guess if you use an STP plug you can ground the drain at both ends - I just left it open at the keyboard end and am allowing it to get grounded at the host end. Works fine.

Interestingly, it comes up with a different model number.
[1637511.148933] usb 2-2: New USB device found, idVendor=173e, idProduct=0038, bcdDevice= 0.06
[1637511.148943] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1637511.148947] usb 2-2: Product: KMX-143-750-583
[1637511.148950] usb 2-2: Manufacturer: DEVLIN Electronics
[1637511.148953] usb 2-2: SerialNumber: KMX-143-750-583

Yeah, potato, po-tah-to

that model number brings this up, which mentions more of the OEM customizable features - also explains why I saw a bunch of unused pads on the switch pcb that looked like they were for some kind of LED drivers (maybe just shift registers?).

this mentions stock trading terminals as an application, which makes me wonder... if you do an image search for a Bloomberg terminal keyboard you'll find a few different versions.

Did Devlin also make at least one version of that?

There's one that does look kinda look the same keycaps but it's a Maxi Switch product.
https://www.linkedin.com/posts/adafruit_the-bloomberg-keyboard-classic-1996-https-activity-6901563827666661376-KTBG