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			   The ornamental design for a litter box cover, as shown and described.     
    
    
    
    
    
    
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FIG. 1 is a perspective view of my new design for a litter box cover, the floral surface decoration and chimney well insert in phantom being no part of the design;
FIG. 2 is another perspective view thereof, showing the hinged door of FIG. 1 in an open position, reveling an attic floor for storage;
FIG. 3 is a front elevational view of FIG. 1;
FIG. 4 is a rear elevational view of FIG. 1;
FIG. 5 is a left side elevational of FIG. 1;
FIG. 6 is a right side elevational view of FIG. 1;
FIG. 7 is a top plan view of FIG. 1; and,
FIG. 8 is a bottom plan view of FIG. 1.
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