The ornamental design for an outletbox, as shown and described.
FIG. 1 is a top perspective view of an outlet box showing my design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof, with the rear elevational view right side elevational view, and the-left side elevational view being mirror images thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is cross sectional view taken through line 6-6 of FIG. 3; and,
FIG. 7 is a cross sectional view taken through line 6-6 of FIG. 3, shown with additional broken line subject matter, in a state of use.
The broken lines in the drawings are for the purpose of illustrating portions of the outlet box form no part of the claimed design.