We claim an ornamental design for a pizza storage container, as shown and described.
FIG. 1 is a top-front perspective view of a pizza storage container, showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a top plan view thereof, shown without its lid for ease of illustration;
FIG. 4 is a top-rear perspective view thereof; and,
FIG. 5 is a top-rear perspective view thereof, shown without its lid for ease of illustration.
The broken lines in FIGS. 1, 2 and 4 showing portions of the pizza storage container are for the purpose of illustrating environmental structure and form no part of the claimed design.