In the GECK I opened the RatCaveINT cell and in the Cell View you can see VFSJaneBrahminREF, which looks like a normal pack brahmin right next to the lamp on the floor of the cave at the quest marker. Problem here is the brahmin doesn't actually exist in the game, so the quest can't be finished.
So what do I do now? I found the missing item referenced by the quest but I have very little experience with the GECK.
The script related to this object is called VFSJaneBrahminSCRIPT:
scn VFSJaneBrahminSCRIPTint dooncebegin OnActivate if doonce == 0 SetObjectiveCompleted VFSDebtCollector 40 1 SetObjectiveCompleted VFSDebtCollector 30 1 if GetObjectiveCompleted VFSDebtCollector 10 == 1 && GetObjectiveCompleted VFSDebtCollector 20 == 1 if GetObjectiveCompleted VFSAtomicPimp 20 == 1 SetObjectiveDisplayed VFSDebtCollector 55 1 else SetObjectiveDisplayed VFSDebtCollector 50 1 endif endif set doonce to 1 endif Activateend