This is the Sliding Box by Jean-Claude Constantin. Eight sliding bars passing through the body of box must be placed in the correct positions to unlock the lid. Interesting and beautifully made.
The Glass Puzzle Box
The Glass Box by Benno de Grote is a box shaped marble maze with sliding keys at the corners to open and close various gates. The box will only open when the maze is solved, and features a clever trick to keep the marble in the start position until a solve is attempted. Very difficult.
Doog’s Greatest Hits V1
This is #57 out of 57 copies of Doug Menzies’ DGH V1 boxes, a complex, multi-step sequential discovery puzzle box designed to feature novel concepts. According to the designer, the box is a compilation of mechanisms from his other boxes which also turned out to interact in interesting ways. An amusing prize awaits within.