The ornamental design for a golfballretriever, as shown and described.
FIG. 1 is a perspective of a golf ball retriever, showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a front view thereof; and,
FIG. 4 is a rear view thereof.
The broken line showing of the golf ball in FIG. 1 and the golf club head
in FIGS. 1-4 is for illustrative purposes only and forms no part of the
claimed design.