I see that in all of the lockpicking guides, they say to make a Box at 30 tinker, 50, and 75. But when I look in my tinkering menu, I don't see a box at all. I've checked multiple guides to see if there was any clarification on this, but have found none, could anyone please help me out and clear this up for me? What exactly am I making, and why does it very across Tinkering skills? Is tinkering all I need to do this?