Larry Spitz wrote:
I have this container which probably at one time held an expensive bottle of
port. I would like to know what type of plywood it is and where I could get
some.

The first picture shows the container closed. The second shows it open. The
plywood is very flexible. It is 1.27mm (0.05") thick. It is three plies.

Lee Valley sells 1.5mm and 0.8mm finnish birch ply, in 25"x25" squares.

Chris