In 1413 he was appointed Escheator of Devon and Cornwall, which office he retained until 1415. In 1415 he loaned 100 marks to the crown to help the financing of the expedition to Normandy, and received as security (from his brother-in-law Bishop Courtenay, Keeper of the King's Jewels) "the Duke of Bergundy's great tabernacle". In December 1415 Richard Courtenay, who by then had inherited Powderham and other estates following the death of his father, died at the Siege of Harfleur, leaving his 11-year-old nephew Philip Courtenay (1404–1463) as his heir. Cary was granted by the king the farm of the lucrative wardship of 16 of the bishop's manors in Devon and Somerset until the heir should attain his majority of 21.