Thanks Myrkul for your propositions and the time you spent. Just some small remarks: How to proceed with bonus stuff apart from stickers, like 'casette inserts', 'move lists' etc. (
example,
example). Should we use a consistent label like 'Bonus' or decide contextual?
Also, how about Registry Cards? Is 'Card' refering to them in an explicit way? Cos' I used to use 'Registry Card Front', 'Registry Card Back'
Maybe there are some releases carrying other sorts of (bonus) postcards, which could cause confusion.