The ornamental design for a golfballretriever, as shown and described.
FIG. 1 is a perspective view of a golf ball retriever showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view thereof, shown in an environment of use.
The broken lines present in the figures are included for the purpose of illustrating portions of the article and environmental structure and form no part of the claimed design.