Amazon.com: Boxes Fast BF20204 Corrugated Cardboard Flat Shipping Boxes, 20" x 20" x 4", for Clothing, Books, Picture Frames, Artwork, and Mirrors, Kraft (Pack of 10) : Industrial & Scientific
Cardboard box doesn't enjoy being flattened : r/Pareidolia
Flattened Box High Resolution Stock Photography and Images - Alamy
Moving Kit for Sale - 160 Moving Boxes | UsedCardboardBoxes