It is a membrane box to store and show delicate small parts safely and can be viewed from both sides. You need ordinary cling wrap from your kitchen, a small board and a sharp knife (like an X-Acto) to assemble. It consists from 4 different parts and is listed in in order of assembling as following:

1. Keder (2x)
2. Box (2x)
3. Blind (2x)
4. Frame (1x)

You can identify the parts on the build plate by its object names.

For assembly follow these instructions and the picture series I attached as assembly guide.

First lay the Keders upside down with the rounded side to the top on a flat surface. Cut a cling wrap to size covering the Keders. Make sure the cling wrap has no ceases.

Then take the Boxes and put them carefully over the Keders. Take a flat small board to push the box on the Keder. It might need some force doing so but not too much. Make sure that Keder and Box are aligned exactly before pressing too hard.

Now the cling wrap should be nicely taut like a drumhead. If not, repeat :).

Take the knife and cut the cling wrap around the Keder away. The knife has to be really sharp for this because cling wrap is not easy to cut.

Take the Blinds with the inner chamfer to the cutted cling wrap and press it on the Boxes like you did with Keder and Box. The Blinds shall hide the cut. They are decorative elements and not necessarily to be mounted.

Now you have two identical parts of which one is pressed in the narrower part of the Frame like you did before with the other parts. The narrower side is longer.

Put your part you want to store onto the membrane, then clip in the other box to the frame. This side is to open and access the content. It has a gap to the frame where you can grab in your fingernails or a screwdriver blade to open it.

Have Fun!