The first two words alone are a shock to anyone who was taught by a Nun. “Nuns STOLE!” That’s much more than a Venial Sin right there! Maybe not quite a Mortal Sin though.
Actually, for the nuns that taught me, my first thought was “That’s all?”
One ended up in jail for child abuse, in the 1970’s. there rest should have joined her.
They were a cult of evil women