Hi PapyStalker.
I have never known Collector stashes to fail to spawn, so first I would suggest making sure you are looking in the right places. (The backpack above the tank can be hard to see against the rocks even if it is there!) The pictures in the walkthrough are a bit small (this will be improved in the coming update) but there are larger and clearer versions in this older document here:
[You must be registered and logged in to see this link.]If you are sure that there is nothing at two locations, return to a save from before picking up the previous stash (Army Warehouses). You already know where that one is, and picking it up again will cause the game to spawn the Radar stash again - and this time it might be in a different location.
If all else fails, you can use the ESC+F4 menu to spawn the stash - enter
- Spoiler:
val_taynik_12
and the backpack should appear on the ground near you. If the new clue is to Pripyat, you have the correct stash.