The Green is because they got wet. The issue is that reloads are only as good as the guy who loaded them. Most people won't touch them unless they are getting them for next to nothing and breaking them back down for their components. Gun shops won't touch them due to liability issues.
I used to duck hunt all the time lots of shotshells in the boat, the blind in rain jackets full of water ect. So I have a 5 gallon container of shells i found in bottom of duck blind ect. It must be at least 4 to 500 shells I sell at garage sale for $50. Have a garage sale about 2 years latter guy comes in says hey you sold me those shotgun shells those made my barrel blow up. It seems some people dont take caution in making sure the wad doesnt get stuck in your barrel when a wet shell does not fully detonate. So his barrel blocked by a wad exploded when he fired the next round. So be carefull with old ammo!
also, if you do get rid of them THEY HAVE TO BE SHIPPED BY UPS.... it is illegal to ship ammo via usps. they have to be in a box and <orm-d cartridges, small arms> has to be printed on at least 3 sides. just sayin...lol.