I go halfway and do the razor blade trick. You slice open a small part in the back, which allows you to get underneath the amiibo where the metal sticker is that blocks the amiibo from connecting. You tear that off with pliers, can be abit tedious, but once you get it off or most of it, you can keep the amiibo in the box for display and use them when you want.
I'm of the side that is more about opening things, but I decided to keep my amiibo's either sealed if I'm not using them or open them if I want to do it, but still have them look nice on a wall.