This is probably a dumb question but I don't have an 8mm in front of me to try this out. So my question is if an 8mm cassette would fit into an audio cassette case? I have a part in my book where my character hides one of these in with her daughter's audio tapes. I would like to have it placed in an empty music case if that's possible? I'm thinking it would be too thick but just want to be sure.