So I found a box of polish sausage seasoning with natural casings that is probably 4 yrs old That hasn't been opened and also found pepper snack stick seasoning with collagen casings that has been opened. Found them in storage where it has gotten in the high 80's. I was gonna throw them away unless anyone thinks it would still be ok. The seasoning feels and looks fine but the natural casing has a light tan color to it.