I'm certain this isn't person error, since the recovery phrase was located in two distinct spots: backed up inside of a file on S3, and printed on the bit of paper. This information describes BIP39, the standard that defines how seed phrases are created, and summarizes how BIP32 and BIP44 https://wiishlist.com/story20118043/the-5-second-trick-for-ledger-seed-phrase-bip39