Level Dependant Edit
At this time it seems the random encounters are not very well documented, so I cannot confirm this on my research, but it seems the encounters are level dependant, ie not triggering unless the dweller is strong enough. Can someone else confirm or refute this? DrakeyC (talk) 00:02, August 22, 2016 (UTC)
I think that it depends on dweller's perception. I've sent some dwellers with various stats to test my hypothesis and so far those with highest perception seem to notice more buildings:
"I discovered and explored Red Rocket Truck Stop"
Cabin Fever Edit
I've encountered two guys thinking they are invisible. I've chosen third dialog - pretended not to see or hear them. Reward - shovel (junk). My vault lvl 60, dweller lvl 50. --Little flying red balloon (talk) 19:09, April 11, 2017 (UTC)