A method for reducing heat loss of hot pizzeria pizza shipped in corrugated box packaging. The method involves placing a recently-cooked pizzeria pizza into a corrugated box having at least one tab-like structure projecting downward from a wall structure of the box and extending beyond a bottom edge of a wall panel by a distance of at least nine millimeters when the box is in a fully-erected format, whereby the method solves the problem of a downward-warping bottom panel of a loaded corrugated pizza box coming into contact with a cool support surface underneath the box.