Stock Photography - long story short, neither of those boxes depict the actual rice inside the box

You fool! Of course neither of them depict the rice inside each individual box. When the two are brought together on the holy peak of Mount Fuji, only then will they merge and form the sacred rice artifact depicted in the mural.

Rice is rice, its not going to be different from brand to brand besides quality control. Might find some tiny rocks or something in a cheap brand.