Some of our people here in holland have warranty, and if your product fails, you have to return it, with original packaging!
I've had several clamshell products, that were a pain in the butt to open. And after my earphones were broken, I had to return them, with original packaging. However, when I came back they didn't accept the packaging, it was too far ripped. And didn't get my warranty, cause it should be send back with original nice package. (I've used a scissor btw) Mostly you can't open them from the top, And the back is thick, and hard to cut with a scissor. (You really have to take a sharp knife or other object to cut it open) But then you risk the hazard of cutting into your product...
Just put a carton box around it I don't care, with a little plastic window. Saves plastic aswell...