What Does Not Belong on This Post Office Counter?

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This post-office counter shows stamps, twine, wooden mail slots, an ink stamp, red ink pad, parcel scale, address cards, and brown parcels. One item does not belong.

What Does Not Belong on This Post Office Counter?

The Answer

The correct answer is: The clear self-adhesive shipping-label backing sheet is the item that does not belong..

Here is why

  1. The stamps, parcels, twine, ink pad, and scale fit the old post office scene.
  2. Look near the twine and stamp papers on the counter.
  3. The clear adhesive backing is modern packaging material, unlike the paper-and-twine setup around it.

Why people miss it

It is related to mailing, so it feels useful. The clue is not the purpose of the item, but the modern material.

What answer did you get before checking?