The Drop-off Box is located to the left of the door for Animal Crossing Items Nook's Cranny and, as you add items to the box, you'll be able to see your total earnings from items placed inside.

There are, however, three disadvantages to the Drop-off Box.

The first is that everything you place in the Drop-off Box will sell LOLGA.COM for 20%, then its usual selling price. This means that you will lose Bells if you decide to place items in the Drop-off Box.