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Haha. We were typing at the same time! At this point I really don't know enough about how HomeKit+Thread is implemented, but you know, I don't think Apple intends us to muck about under the hood. I could conjecture up some thoughts on why you're other HPM show up as just "Thread Router" but it would be just educated guesses -- namely you don't have any need to connect to other devices using Thread, e.g. more Eve devices. You might try moving the Eve Energy plug around and see if that changes the "Apple Thread Routers."

Two final thoughts:
- If you want to match up the letter codes to HPM's you could unplug them one at a time and see what disappears.
- Look in your Home app > ... > Home Settings > Home Hubs & Bridges. Do ALL your HPM's show up here? My guess is, no.

Best of luck!
Yep, all minis are listed in there along with a bunch of non thread hubs consisting of OG HomePods and older ATV 4Ks. 20 in total.
 
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