The ornamental design for a scoopholderbase, as shown and described.
FIG. 1 is a perspective view of a scoop holder base showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof, the rear being the same in appearance;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a right-side elevation view thereof;
FIG. 7 is perspective view of a second embodiment of FIG. 1, the only difference being the configuration of the interior of the base, it being understood that all other surfaces are the same as those of the first embodiment; and,
FIG. 8 is a perspective view of a third embodiment of FIG. 1, the only difference being the configuration of the interior of the base, it being understood that all other surfaces are the same as those of the first embodiment.