I am certain it's not user mistake, Considering that the recovery phrase was found in two unique areas: backed up in a file on S3, and printed on the bit of paper. Standard recovery phrases use a specific list of 2048 words following the BIP39 standard (Bitcoin Advancement Proposal 39). https://bookmarksaifi.com/story18878583/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator