vintage 20 MuleTeam Powdered BORAX 4 oz Box household advertising unopened RARE For Sale

Small box of Borax powder (not soap bar) still sealer after many years. Undated but my guess it is from the 1950s or earlier. Perhaps it was a sample box since it is small 4 ounce size. ?? The borax has caused the box to "bloat" and it is somewhat rounded. It is unopened and has no powder loss. Still nice color. My pictures will provide the best description and I have shown all sides. Side panel is sketch of the muleteam pulling the borax across Death Valley. The old TV show Death Valley Days hosted by the Old Ranger was set back in western days of the borax mining. Thanks for viewing.