Most I ever found was mice…
I bought an older home and while doing some renovation, I was in the attic and back in one corner behind a chimney tucked under some insulation, I found a Buster Brown shoe box full of early ‘70s football and basketball cards. Among them, 6 Roger Staubach rookies and a couple of Dr. J rookies. Quite a few others currently in the $300-$400 range. Not a bad score.