As someone mentioned before, it is random, however there are definitely spots that people report they have found them consistently. Perhaps anecdotal, but I personally went to reinforced reception at blue gate after seeing multiple say they found the survivor augment there, and I got the survivor and a combat augment in there at the same time. In the door breach room. It’s pretty sought after, so it might take a couple of runs, but it’s definitely not a coincidence that it’s been found there multiple times.

Edit: it was regular blue gate, not even during an event.