"Burn victims"
Not too sue of that from what I see. That bottom left stamp in 3rd row appears to be toning, tropical staining, rust, or in other words fungus. Isolate it from the rest as it will spread to others over time, faster in humid climates.
1st stamp in first row. Met Life perfin.
3rd stamp 3rd row, not able to determine, looks like pacman perfin.
