Puzzle Box

Here we have another Puzzle, again not my idea, this time in the form of a Puzzle Box, the idea with this puzzle box is that you open it from the closed position and place something inside the box, then you close the box, then open it again and what was there has disappeared magically.What it is is actually happening is this, it's an outer case with a main drawer slider with no back in it and then another sliding box albeit smaller within that, to make the puzzle work there is a hole at the bott