To add on from lmme the user needs to return the item to the correct position or else the system keeps that item in their "basket" and will therefore be charged for it. So the user is incentivised to return things properly or they get charged for things they arent taking if that makes sense.
One of the very early videos for monop showed an example of this. The item listed in their basket was lnly removed when returned to the correct shelf.
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