Try searching for fd1701308201130201010420 in the wallet using a hex editor. (Or perhaps some smaller portion like 0201010420). The next 32 bytes after that string would be your private key, assuming super old, unencrypted wallets.
Edit: Oh. Also, show how you're searching for these strings in the hex editor. (With a screenshot, and not with your wallet.dat open just so nothing private is revealed.) Most allow for searching for text and hexadecimal. Maybe you're searching for hexadecimal as text or something.
0201010420 returns countless results .. fd1701308201130201010420 returns nothing. Using Hex Fiend, The wallet I was attempting to search is from late 2013. Searching in Hex, I also have the ability to search in text.
I repeated search with valid up to date wallet.dat file and was unable to locate "fd1701308201130201010420"