Some nice puzzles

Here are some rather nice wooden puzzles found by Noel-Ann on recent trips.  I'm not commenting on solutions here!

Two Marbles

Noel-Ann found this one in Texas.  The object is to get the two marbles into the holes simultaneously, like this:

A Secret Box

The other puzzles were brought back from a market in the Dordogne. This, amazingly, is a secret box which can be opened by performing a series of operations.

A packing problem

This one starts off as a rather nice box with a red slab on top.

When one slides the lid open one finds that it is packed full with more wooden blocks.  How can one add the red block and close the lid?

Another Packing Problem

This one has four pieces each composed of two overlapping slabs. Can one fit them into the tray?