I believe the older ones were not as strong as the newer ones. I have some in old boxes that I use only for paper and newer boxes for game. I think this info was from dogzapper???
jmho
Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".