SOLVED!!!!
I moved the passenger seat all the way forward, tilted it forward and raised it as high as possible. This exposed a slit in the carpet under the seat. Had my friend kneel down in the back seat floor while doing circles in a parking lot causing the M&M to roll to one side, then turned the other way and VOILA there it was. He was then able to grab the subject M&M. Fun fact, he also found a toonie ($2 coin) in there, which technically this M&M made me money. Ok fine, I may like M&M's again and may have used the $2 to buy another bag.
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