These are the letters that was posted on the USPS operation santa program website for generous people to fullfil. Here you can see what people wanted for christmas, and how many percent are completely outragous requests. And how many percent of letters were sent in mass

There are also ones for past years: https://archive.org/details/usps2024 https://archive.org/details/usps2023 https://archive.org/details/usps2022