Hello amigo, Your mnemonics technique to remember a Russian word is very useful, althogh I almost find impossible to find the corresponding with some of them. I started to make a mnemonic dictionary translating from Russian to English&Spanish. Do you have somthing similar that we could exchange?
There's a whole website dedicated to memorizing words in other languages (and even studying other stuff) using such mnemonics. It's called memrise.com - you can look for me on there under the same username. I started a Babylonian Talmud Aramaic course with audio - if you look for that, that should help you find me. You can even make your own course on that website
You could try reporting it, but in English you would be pointing out both the ball and the box equally. I think that the Russian is emphasizing that in this location is a ball. So this is an answer to "What is in the box?" Your sentence answers "What is there?", but I don't know if they would structure the sentence differently for that. They do mention that if the question were "Where is the ball?" the ball would come first in the Russian with the location last and I am not sure if yours would be better with that form or not.
All these "В чём-то что-то" seem to have an incorrect emphasis, it doesn't feel right. In this case "В коробке мяч" is more like "In the box there's a ball" than "the ball is in the box" (which would be "мячь в коробке"). The exact meaning of "в коробке мяч" depends on the context.
Sorry, I'm new learning Russian and not a native English speaker. I translated the sentence as the ball is in a box. It didn't accept it. Which would be the difference, how can I say the ball is in the box. I want to compare and understand differences. Anybody can help me? Tks!