The ornamental design for the soft toy chest, as shown and described.
FIG. 1 is a front perspective view of a soft toy chest of the present invention with the lid open;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front side elevational view thereof;
FIG. 5 is a back side elevational view thereof;
FIG. 6 is a top plan view of the present invention with the lid closed; and,
FIG. 7 is a front perspective view thereof.
The dots in FIGS. 1 and 3 to 7 are stippling that represents curvature of the soft toy chest. The broken lines showing the inside surface in FIG. 2 represent a portion of the chest that forms no part of the claimed design.