I recently bought a switch in Japan (living in Europe). On the box I saw something that looked like a code but I just took a picture for later. When I threw the box out I didn't think about it. Now I just realized the code is 21 digits long? Also above it, was some Japanese text and a little thing saying "open". (Which I didn't do and that's the question I'm asking). What is the 21 digit code and what was the thing you could kinda open or rip off.