Thanks!
This is can be kinda tricky, especially becouse bad translation. =(
In ReadMe file i wrote the walkthrough.
In short, in every videotape you must finish some like 'quest', with using item from another videotapes.
After this in vedeotape you will have acess to Box code part, in some cases not direct (for example, in Cybershop you must boucght some item and exit the shop, next go south; money you can find in anotrher videotape...in another example, in Deimos-Express you must 4 times take deliver to right recipient and you will see some cutscene).
If you really stack, please write in there againg and I will try to create a video walkthrough.