Re: How can you verify the randomness that's coming from a hardware?
Get one, write down a B or a W, eat it, get the next one. Repeat until nauseous. It's much faster than flipping a coin, and less boring 
But of course there probably isn't an even number of blacks and whites in the bag, and with each one you eat you reduce the odds of that color appearing again. So overall a bad system. 
Yeah. From the looks of it, whites appear to outnumber blacks significantly - so it wouldn't be an effective entropy source at all.