Blade disposal slots and disposal of used blades. Some thoughts.

I just use an an altoid tin box or one of those nuts box you get inflight. More than storage, I am worried about disposal. Waste segregations esp where I live sucks and I always fear that someone might get hurt if i dispose them. I will most likely dump them in a steel furnace if at all i find one - that way i know for sure it won't hurt anyone!
 
I have 1 like these, instead of money it has dinosaurs, only €1