I am absolutely sure this isn't user mistake, since the recovery phrase was found in two diverse destinations: backed up in the file on S3, and printed on the piece of paper. Standard recovery phrases use a selected list of 2048 words following the BIP39 standard (Bitcoin Enhancement Proposal 39). https://atozbookmarkc.com/story19011921/bip39-seed-phrase-mnemonics-generator-an-overview