Frye had a meticulous, exacting mind, and he left extensive records of his work with Eddy and her household. Among the collections of The Mary Baker Eddy Library are six boxes of financial record books that he kept, ranging from 1886 to 1917. Frye used account books, bank books, ledger books, and check books, each serving a different purpose and recording the credits and debits to Eddy’s accounts—from purchases of a few pennies up to thousands of dollars in income. After her passing, he kept track of the expenses for the caretakers at her Chestnut Hill home for a few years, and also kept track of his own personal expenditures.