Recently found 2 dime bags of white powder at a nightclub

Hi guys! The other day as I was leaving a club I looked down and found 2 dime bags of powder. I'm not an idiot, so I haven't done any. No reaction to marquis or mandolin test, leading me to believe it's coke. Is there anything else I can do to be more certain of what's in the bag aside from buying a dedicated coke test kit? I also have mecke and another test I haven't run yet. The contents are pure white and completely powdery. No crystals or anything like that.

Thanks!