Some stores now have automated lockers for parcels, which is a lot more efficient than waiting in line for a lady to give you a number. The only problem is that the directions are a little confusing...
The top notice says "Do NOT place things in open lockers."
The bottom one says "Place your things only in the locker that was OPENED BY YOU."
Maybe it isn't confusing to native speakers. If the top one had an EXCEPT OPENED BY YOU statement it would be a little more logical, in my opinion.