I claim the ornamental design for cocktail chest, as shown and described.
FIG. 1 is a right front perspective view of a cocktail chest according to an embodiment of the invention.
FIG. 2 is a top view of a cocktail chest according to the embodiment of the invention.
FIG. 3 is a front elevational view of a cocktail chest according to the embodiment of the invention, the rear elevational view being a mirror-image thereof; and,
FIG. 4 is a side elevation view of a cocktail chest according to the embodiment of the invention.