Foreman's Lunchbox
Foreman's Lunchbox is found at [57.4, 28.7] on the upper level of the scaffolding just inside the wall by the main entrance to the Archenon Siegeyard in northeastern Talador. This is a little platforming puzzle. Get on top of the upper scaffold by getting on top of the small hut just to the north of the scaffolding, then jump over to the other hut to the east, then on to the smaller scaffolding east of the hut, then on to the two small pillars and finally on to the upper scaffolding. Do it on foot.
The lunchbox contains the 
[Tasty Talador Lunch].
Tracking quest
To check whether the Foreman's Lunchbox has been looted, copy and paste this command into the chat window:
/run print(C_QuestLog.IsQuestFlaggedCompleted(34238))
If a "true" appears in the chat window, the Foreman's Lunchbox has been looted; "false" indicates the opposite.
Patch changes
Patch 6.0.2 (2014-10-14): Added.