This geocache is NOT at the posted coordinates
la·gniappe /ˌlanˈyap/ something given as a bonus or extra gift.
This is a bit of lagniappe for completing the Adventure Lab series Cities of the Dead III. During the course of completing the Adventure Lab locations lab cache you will be piece together the code by completing the lab stages for the coordinates to the geocache final.
The Bonus cache is not located in a tomb and there is no reason to enter a tomb to complete this. Please be respectful of the location and mindful to cause no damage during the course of this walking tour.