Fun fact: Redbox is operated by Chicken Soup for the Soul. I almost got hired by them but they screwed me over after I had already resigned from my previous position.
I think I have the answer. It's because the pedo/edgy hispanic slang, "caldo de pollo", "caldito de posho" and so on, it refers to CP, but yeah, it doesn't have sense in English. There you go a image of national police of Peru.