The ornamental design for a chef's hat container cap, as shown and described.
FIG. 1 shows an elevational view of the outside of a chef's hat container cap constructed in accordance with this invention; the broken lines showing a container are for illustrative purposes only and form no part of the claimed design;
FIG. 2 shows a side view of the chef's hat container cap of FIG. 1; the broken lines showing a container are for illustrative purposes only and form no part of the claimed design;
FIG. 3 shows a top plan view of the chef's hat container cap of FIG. 1; the broken lines showing a container are for illustrative purposes only and form no part of the claimed design; and,
FIG. 4 shows a bottom view of the chef's hat container cap of FIG. 1; the broken lines showing thread channels for attachment to a container are for illustrative purposes only and form no part of the claimed design.