Am I the only one that think that might be a hoax? How is the post card be preserved for a century without significant damages to it? Moisture, mold and other n

Am I the only one that think that might be a hoax? How is the post card be preserved for a century without significant damages to it? Moisture, mold and other nature situation would have destroyed it in a few decades. I really want to hear the back story of this story. Also, the address still EXISTS after a hundred years? No rezoning, no town name change or street name change? Many rural houses built in 1920 would not have survive 100 years without major overhauls.