Eben's Puzzle Box

For Eben Moglen's 50th birthday, I made him a puzzle box. To open it, he needs to decipher the clues on the front and do something to the box. He keeps saying he knows how to open it but hasn't had time to actually do so. I'd like to see him succeed because the gift inside is also rather neat.

I already know what my next box is going to be and who it is for. I hope I have time to make it before his birthday.