Mealies, easy way to dig them out of the substrate?

[Edwin]

I just purchased 5 dozen mealies and they are now sitting in my fridge in a mix of oat bran, rolled oats, shredded coconut, powdered milk and other grains. The substrate is about 2-3 inches deep, and I was wondering if there was an easy way of digging them out of the substrate. I was thinking of using a sieve or maybe a cat poop scooper.

Any ideas please? Thanks!