Help, i am stuck.

[Libbio ger]

I am in the mission "the price goes up" and i have to search Nestor's stash, but i can't reach or find it. my missions marker points to slag heap, but i have search this place for an hour. did i miss something or did i soft loced me?

[BOI]

Waiting for a step brother there?

[Sadarex]

Start at the left of the main building and follow the mission markers. They update once you reach them and they guide you trough a route up to the top.

[Stalker]

Any idea if anything happens if a step is missed on this questline? I missed "find the dig site" and yet, was able to complete it. Now that I actually found the cave, unable to close out the location hah. Any impact?