Bip39 Seed Phrase. You would then do a primary recovery with a command like the just one beneath. (This command works by using a sample wallet file bunlded with BTCRecover) Anybody else who discovers the phrase can steal the bitcoins. It must be retained magic formula, one example is it https://thejillist.com/story9277277/bip-39-https-linktr-ee-bip39-bip39-words-an-overview