Last week, I finally decided to cancel my Amex Platinum card. I had been a long-time card member, but at this point, the annual fee outweighs the benefits I’m currently enjoying. I’ll write about my reasons in a future post. When the American Express phone agent read through his disclaimer as I canceled, I was told I needed to destroy and dispose of my physical cards. I told the agent that I had the new, fairly hefty, metal version of the card. “Do you have any suggestions for destroying my cards?” I asked. “I’ll tell you what,” the agent replied, “I’ll send envelopes that you can use to mail them…