With those three pieces of info, my new take on the timeline pre-amnesia:
First, this timeline:
Before 10pm - We run into a problem that the Johnson failed to mention, we suspected intentionally. Blue Team may be unaware of this info as the conversation with the Johnson might not have been shared with them
10pm - Sam renegotiates with Johnson and fails. Probably the point at which the plan involving the bomb is conceived. Again, Blue team likely unaware of the details here
12am - we wake up in the van, memories wiped clean, bomb unused.
Thoughts:
We were hired to retrieve the artifact. It is unknown whether we knew what it was or not. It sounds like we did not - probably promised a milk run and realized that stealing such a powerful artifact would piss off a number of people.
We discovered what we had in our possession and that we had been misled, potentially fatally.
We devised a scheme to get our money and get out safely:
a. Just before meetup (probably at a new location chosen by us), attach bomb. If they don't pay, artifact goes boom. If they kill us, artifact goes boom.
b. Blast radius is such that we can be allowed to take our money and leave the meeting site (ensuring our safety) before disabling it since we would be unlikely to get far enough away to survive if we didn't honor our word to not detonate
We activate the artifact - accidentally most likely - and it knocks us unconscious and takes our memories. Chances are it won't trigger for us again since it already has our true selves (souls). Crash ensues. The activation might have been during the attaching of the bomb.
Which brings me to another question - was the bomb loose in the van or still stored in Sam's bag of tricks? If it was loose then that strengthens the argument that we activated the artifact while attaching it, which would then mean that we were within an hour of our planned meet-up.
OOC knowledge:
Red and Blue team were likely not working together as we had not synchronized our radio communications. Also, Katsina had been using her influence spell on Ohanzee at least, perhaps others. With our memories wiped, that becomes mostly irrelevant other than attempting to rebuild the timeline. In other words, our plans may have changed mid-mission as a result of Blue Team's influence. In fact, Sam's anger might not be attributed so much to our discovering something new about the mission as much as an implanted distrust.
Oh, how I wish Grimwulf had used Assensing in the early moments after the team awakened...