The ornamental design for the boat bumper key float, as shown in the accompanying drawings.
FIG. 1 is a front elevational view of a new design for a boat bumper key
float wherein the rear view is a mirror image thereof and wherein the
portions in broken line are for the purpose of environment only;
FIG. 2 is a side elevational view with reference to FIG. 1, the opposite
side view being a mirror image thereof; with the broken line portions for
environment only; and,
FIG. 3 is a top plan view, the bottom plan view being a mirror image
thereof.