Place the flat box with the outside face down and the inside face up. You'll notice the folding lines in the cardboard.
Fold the panels along the creased lines. Be cautious not to fold them beyond 90 degrees.
On the far-left side, you'll find a small thin panel that needs to be attached to the far right-hand side using the provided double-sided sticky tape. Apply the tape to the thin panel and secure it to the inside of the far-right panel.
To secure the base, start by folding the smaller side panels inwards towards the centre. Next, fold down the wider panel, which covers the two smaller panels. Finally, fold the tab panel inwards and push it through the bottom, effectively locking it in place.
Lastly, close the lid and secure the tab in the front to firmly shut the box.
By following these straightforward instructions, your postal box will be ready for use in no time!