I agree with BT's post. I think a Scrounge skill check would be most appropriate (do they have the Scrounge skill in V2 and 2.2?). The level of success combined with the skill level should determine the amount of spent cases found (perhaps with a small randomised element as well). Also modifiers should be assigned for terrain/cover/weather conditions etc. So a character with high Scrounge skill who rolls a really high level of success should find 100% of his spent brass, possibly modified downwards by a dice roll and/or environmental modifiers.
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