The ornamental design for a earplugcontainer, as shown.
FIG. 1 is a front and right side perspective view of an earplug container showing our new design;
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof.
FIG. 5 is a right side view thereof.
FIG. 6 is a top view thereof.
FIG. 7 is a bottom view thereof.
FIG. 8 is a rear perspective view thereof; and,
FIG. 9 is a perspective view of the design shown in use, with the broken line environment being for illustrative purposes only and forming no part of the claimed design.