When I access them, the trade windows says "Welcome to Silver Arrows HQ <type> dealer"
Also, the getplayerinfo command ran against a player docked at Camelot, returns that the player is docked at Silver Arrows HQ.
Guess I've been housing some spies all this time...
I think that the reason for this might be that ID 655501 (news.dll) which holds the string Silver Arrows HQ is assigned in universe.ini to both Silver Arrows HQ and Camelot proxy bases.