They did not, I tried that.

I am not sure what you mean by "once you wanted to sell them all, just before that they disappeared". There's nothing mysterious here, I have been accumulating them all season as a nest egg for my characters- so they could be sold to offset the cost of re-rolling gear at lv 100; it gets expensive pretty fast. That would be a pretty common thing to do, I'd have thought? I have three chars at 100 this season, they have expensive tastes.

So I re-rolled some gear to start on a +dmg on enrage and vuln setup for my Psyker, burned through a load of cash. I then went to the stash to grab a bunch of intels and sell them to make some of the money back. I think they sort towards the end of the stash by default. I flicked to the tab, they were gone. All the psalm codes, shards, gear and buff consumables were in the right place, just intel missing.

So yeah, that was a kick in the teeth.

The best part about this? Other players- a few people on Discord actually offered me a couple of stacks each, which was super-handy- that was enough to get some working capital. I then poopsocked for the rest of that Sunday in Week Of The Hoard with the appropriate tarot to farm back as many more as I could before I had to go to bed. Other players are really surprisingly cool in this game.

I have been, watching it like a hawk. Thankfully my much smaller, replacement stash of intel has not vanished (yet) :)