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If you want or need to, you can catch up on the entire story to date by either going to the first page and navigating through page-by-page using the arrows at the top, or you can read the story ten pages at a time by opening the Learning from Elders category on this site.
And you were left a safety deposit box, delivered at this specific time.
Exactly. A time machine?
They used a similar approach in “Back to the Future II”
Read “Time Enough for Love” and how Lazarus Long communicates with his family through time using letters in nested envelopes to be delivered and opened at specific dates and times.
Or, for an even earlier example, read the Foundation series for how Hari Seldon communicates with the Foundation centuries after his death.