I'm on lvl 21 on my iPod and have only 1 diamond from 3 lockboxes in approx 24 hours with no lockboxes waiting to be opened.
During the same time on my iPad at lvl 76 Ive snagged 6 diamonds from 18 lockboxes with 11 waiting to be opened.
I recall someone saying the amount of energy &/or stamina used contributes but damn. It doesn't seem fair.
On top of that I'm trying for lesser level loot on my iPod vs real nice loot on my iPad.
--------iPod-------
3d gets Trick Shotgun 16/13
5d gets Grill Adjuster 35/31
7d gets Combat Holster 35/44
10d gets Diamond Strap 162/171
--------iPad--------
3d gets Rusted Golden Gun 17/17
5d gets Diamond Dusters 43/37
7d gets Laser Gun 58/38
10d gets Diamond Heater 212/221
Why the disparity? It seems like Class Warfare.