You're very lucky you found him. Someone I know recently lost his Agility Champion to suffocation in a chip packet. We didn't even know it was a thing but there is a Facebook page and several dogs a week die this way. We have become fanatical about snipping off the corners of the bag once we've finished with them.
Hahaha. My cat does this with plastic bags... And its sad to hear that several dogs die a week because of something like this. Wow. I make sure not to leave any bags down where the dogs can get at them anyway since I don't want them snacking on something that could be dangerous to them.
I also was unaware that dogs die from this several times a week never heard of that before! But I can always tell what my pups are up to if its too quiet in the house then I know they're up to trouble and most likely chewing on something they shouldnt!