FIG. 1 is a perspective view of the flat item separator showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a one side elevational view thereof (the other side view is a mirror image of FIG. 6);

FIG. 7 is another perspective view of the flat item separator; and,

FIG. 8 is a further perspective view of a flat item separator.

The broken lines showing a panel on the separator arm, paper, a hand, and the bottom surface in FIGS. 1, 2, 3, 7 and 8 are included for the purpose of illustrating environment and form no part of the claimed design.