The ornamental design for a tiebox, as shown and described.
FIG. 1 is a top, front and side perspective view of a tie box showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is left side elevation view thereof, the right side being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line showing walls of the box and cuff links is for illustrative purposes only and forms no part of the claimed design. All sides not shown form no part of the claimed design.