As a minor league Official Scorer for 20+ years I will admit that I have not seen this happen, YET! I was asked about the ramifications, if any, in the following scenario.
First batter of the inning hits a triple and when he arrives at third base sheds his protective gear, handing it the third base coach. Of course in this scenario the team's dugout is along the first base line. The next batter hits the first pitch high and deep to right center field so everyone assumes a sacrifice fly. Is there a penalty/violation if after the ball is caught, the coach hands the runner his protective gear to carry into the dugout?
I do not believe 6.01(a)(8) is in play here, but my recommendation to the coach was just don't do it.