the War Hill
time left: 00:30:11
Patrol to the War Hill on the front line to the Dark Lord.
Thaler 171
Exp 14
Discover +0.27%
find chance (random): 47% item quality: +28% Chances of success: 100%

Duration:
00:16:23

Here you see a typical War Hill mission. Note that the chance of success is 100% so it cannot fail.
Also note the chance of finding an item is supposedly 47%

The issue: I today got a variation of this with the duration under 5 minutes, and the time left was about 50 minutes, meaning if I sat in front of the computer and started a new mission every 5 minutes, I could get in 10 missions.

Needless to say, I rejoiced at the opportunity to score big on items. Theoretically I should have found an item about half the missions.
Actual result: after about 10 missions, nothing. Never found an item.

Statistically, this seems improbable. So either there is a bug where the find chance of 47% is not being applied, or else there is a bug in displaying the find chance. Either way, this makes trying to apply any strategy in picking missions based on % chance of finding an item problematic.

Note: it looks to me like "the War Hill" always shows 47% find chance, regardless of the duration or success chance, which both vary. So the bug is probably in the display of the find chance.

UPDATE: I found a War Hill with 27%, so the above is incorrect. Still, I get a lot of them with 47% find chance, and my subjective feeling is that too many of those end without finding anything.