Box Mounting Adapter

FIG. 1 is a top perspective view of a box mounting adapter, showing our new design; FIG. 2 is a front elevation view thereof; FIG. 3 is a right side elevation view thereof; FIG. 4 is a left side elevation view thereof; FIG. 5 is a rear elevation view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom view thereof. The broken lines in the drawings illustrate portions of a box mounting adapter which forms no part of the claimed design.