Found some old "backup" stellar wallet files from Feb. 2018. Are they of any use?

MoneyBunny68
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I found two .txt files I put as backup files, one being titled "wallet2018216_13311" and "wallet2018218_19455". They're each a string of 548 random character. They don't with an S so I don't think they're secret keys, but they may be private keys. Any to my wallet with them?