lol the 6 SSWs? I have 20 all acquired since their release with GE 4. I don't know if they were available in any other specials but mine all came from GE. Don't know what traz has to do with it either, maybe you mean ToR as those buildings are in the jades? Personally mine is 8 but I've gotten many many more SSWs from the 64th chest, and sometimes in the 48th chest if I'm not mistaken than any relics provided. Those buildings just take nothing but time to amass. I have 13 fountains of youth in the inventory as well, it's nothing but time. You can't tell how long a persons been playing by what era they are in. ForgeDB pegs his MK city as being slightly over 1 year with 3.5K battles. (more than I have at more than twice the city age). That is also his lowest point world. He seems like a good player but nothing he has is remarkable or out of the ordinary in the least. I don't mean that as an insult to him but he obviously knows the game well, you'd almost expect him to have more SSWs given his time in game but maybe he doesn't or didn't finish GE each week.
If you're not getting to the last lvl 4 encounter than you are missing out on the main source of these buildings. Each week is typically a SSW or a store building 50/50 a FoY 50/50 store, a TF 50/50 store or 50/50 TF and SSW.