I'm positive it's not person mistake, For the reason that recovery phrase was found in two distinctive areas: backed up within a file on S3, and printed over a bit of paper. Standard recovery phrases use a particular list of 2048 words next the BIP39 standard (Bitcoin Improvement Proposal 39). https://bookmarkproduct.com/story18939187/little-known-facts-about-bip39-seed-phrase-list