The ornamental design for a holder for tissuebox, as shown and described.
FIG. 1 is a bottom perspective view of a holder for tissue box, showing my new design in an environment of use;
FIG. 2 is an exploded view top plan view thereof;
FIG. 3 is an exploded bottom view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is an exploded left side elevation view, the exploded right-side elevation view being a mirror image thereof; and,
FIG. 7 is a top perspective view.
The broken lines in FIG. 1 depict environmental subject matter of tissue box, spring and fastener for the invention and form no part of the claimed design.