Router via Slave Socket

Well it is a master socket of sorts (ring capacitor and surge arrestor in there). It could be a really old socket that pre-dates the NTE5.

If it is a master socket there should only be a single pair connected to it. Where does that cable go to?
 
If it's being used as a master then it's a 3 pair drop wire, and all pairs have been connected. It's unlikely.
 
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