I don;t know much about special encounters but I think it has to do with LUCK and outdoorsman. Last wipe I was leveling my sniper near Theme Park(obviously) and bam Hidden Bunker encounter then 2 days later another one.
I still don't know what about finding it multiple times with one character?
Confirmed by dev/gm? Or it's just your opinion?
Why shouldn't I've been asking not seriously?