The ornamental design for set of pocket corner caps, as shown and described.
FIG. 1 is a front, perspective view of a set of pocket corner caps;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The dashed broken lines in the drawings are included for the purpose of illustrating environment and form no part of the claimed design. The dash-dot broken lines in the drawings are included for the purpose of illustrating boundaries and form no part of the claimed design.