Do you recall which combat encounter you got this drop from? I've beaten the "We found the N's einherjar! Light it up!" a number of times now with no drop. Have not gotten the "think we've found the source of those readings" version, though, since I haven't messed with the loci yet. And I haven't beaten the heavy guard +2 burners encounter because I keep starting with a terrible hand each time I run into it.
Containment Procedures / Discussion
This is the discussion related to the wiki page Containment Procedures.