How can you find HIGHLY COMBUSTIBLE BOX? Because you cannot make it from other seeds. This item belongs to special category. HIGHLY COMBUSTIBLE BOX gives experience points when broken. Bang away... You'll be banging a lot. You get at least 1 seed back (maybe more!) from splicing HIGHLY COMBUSTIBLE BOX. Will you strike it rich? You just have to count the gems yourself. Massproducing HIGHLY COMBUSTIBLE BOX can be tricky. You will find out after you have harvested a few.