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Art by Eddi van W. on Flickr

Ask Me synchronicity ... 18 years later: In 2006, ninazer0 asked for help identifying three works of English Juvenile Historical Fiction, later finding the answer to one of the mystery texts. In 2024, tangerine asked about mid-century kids' historical fiction about the Hanseatic League, and paduasoy's suggestion was not the author OP was looking for, but it did resolve the earlier mystery. Then melisande added more info for the earlier question. Delightful!

72 years ago in Iowa, a worker named Mary Foss wrote a message onto an egg. She put the egg into a carton and sent the carton out for distribution. Last month, someone responded