its just a time capsule, and after they open it in a hundred years, they will add more things to it and seal it for another hundred years or so, think of it as a message in a bottle that will appear in the future 100 years from now, the bible will be in it, and other things that want to make sure is preserved well into the future
they are all over the place, corner stones of buildings have them also, my grade school had one and each class got to add something to it, its when they teach us about them in school
tell you what, print out the entire patent office, and seal it in your own time capsule to preserve it, that your family will find it 500 years from now, what will that make your family in the future, all you did was send then a message from the past to them in the future, see how that works?