Actually, my wife took it to the return desk. We were in quite a hurry to do the shopping and get home. I just asked her if she told them and she said she did. But, since it was unopened, they could resell it. So, they'll write something somewhere. But, I don't know if it will start any process. It depends on how closely they monitor these activities.
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I should've taken a better look inside the bag though... now I'm curious how many there really were in there.
I didn't bother looking at all of the types but from the ones I did look at it most closely resembled the rice or maize weevil:
https://en.wikipedia.org/wiki/Rice_weevil
https://en.wikipedia.org/wiki/Maize_weevil
However, I seem to remember the ones I saw being a more grayish color.