And the one buried at Olglethorpe University containing items from the 20th century including an entire full-size Volkswagen Bug. I hope they have battery chargers in the future. The most insignificant things sometimes are perfect. You throw away newspaper ads. But how interesting it is to find an old ad selling soup for 5 cents.
TV guides are great.
Even just writing down your thoughts at the moment can be so interesting years later. And thoughts don't have to be momentous - like world peace, or the nature of mankind. One of the most interesting archaeological finds I've seen was in a Roman bath in Vichy, France. I always thought of the Romans as very staid and pompous. That is the question.