The house was constructed around 2000. I can't find any kind of identifying markings, and it's in the back of the house above the boiler (not near any incoming utilities which are in the front). It's roughly the size of a faceplate and about an inch deep. The bottom has a cable going into the house that seems to match some of the cables used by the boiler like the ones for the thermostat, maybe 18 gauge or smaller. It may be connected to the boiler somehow, there is insulation stapled in place and I haven't detached it to see where the cable goes but it's difficult to get to being above the boiler.
I tried to unscrew it to open it, but I ran into resistance turning counter clockwise and eventually broke the plastic inside, now it just spins freely.
When trying to pry off the cover, it has some movement around the edges, maybe a few millimeters, so it's not glued shut. However it is still on pretty tight