Ok so it says there are 14 items now and I only have 13. What am I missing?

Before you go for the item "LeMarchands box", you need to watch the ending from room 11, by taping the wall at the left, a secret door open.

After having all the collectable's from here:

https://www.appgamer.com/mechcube-escape/strategy-guide/all-collectibles-in-mech-cube-escape

You will have 13 items.

The final endin is at room 11, at the secret door.
And the item is the mug that appear on the ending.

Where the last one