<prompt> Human: Hi Reddit,With the slew of various financial scams that target older people, my grandparents and the rest of our family have been very wary of things that seem too good to be true.But something strange just happened to them. Out of the blue, they received six 10,000 savings bonds in the mail from the Bureau of Public Debt three in my grandmothers name, and three in my grandfathers name that were supposedly purchased in October 2001. When they took them to the bank, the bank said they had matured to 23,000 each and the money was deposited into their account.My grandparents have no recollection of having purchased these bonds and are at a loss for how they couldve forgot investing 60,000 in bonds. Were also all very confused about why theyd just be sent in the mail when theyre worth so much money; what if theyd gotten lost or stolen? We would literally have never known they existed, and now we dont know if there are other investments of theirs that theyve lost track of.Does anyone know of a way to determine the history of a savings bondtrack where they came from? Does the Bureau of Public Debt really just send bonds to people in the mail? Why did they get them mailed to them when the bonds were 17 years old when theyre 30 year bonds?Any insight would be GREATLY appreciated.  <response>: Its possible that someone found the bonds and returned them, which then triggered a reissuance. But the fastest way to find out is probably to call the bureau of the public debt and inquire. 