Ah, there might have been something that fell through the cracks but I'll try and clarify.
If you're getting a flag from using the password Orlando used, that might be a bug. There's nothing in the script on my end that checks for that word in particular.
Then as far as traumatic events go, morphic resonance works on trauma, by extension so does the vault. But we know after talking to Thanatos on day 17 that he's unaware if he's "died" at all too. The reason being you can't be traumatized by something if it kills you. This is the main reason you can't see your own death in the vault given a lot of it can be described as inherited memory from a past version of yourself. Dave is traumatized when he seems Benson dead. Orlando is traumatized when he finds Dave dead. Dave can't be traumatized by his own death, or rather pass on the memory of the trauma given he doesn't live through it to remember it.
Looking at David's example, he saw Dave die and it's presumed that in a previous loop to this one he survived the shootout whereas Dave didn't. The 'event' ended with David alive and traumatized and Dave was dead, fulfilling the requirements for a vault vision in the next iteration of the universe
For us to get a vault vision specifically of Dave's death, we'd need to be seeing things from (or more accurately in the perspective of) a different character.