Quote from: ShyAngel444 on October 08, 2024, 06:04:38 PM

Wallet1 is 67kb. Wallet2 is 62kb. When opening these wallets in a notepad, we can see ckey values.
This is a sample of Wallet 1's format in Notepad:
https://imgur.com/a/4bvrUVx
This is a sample of Wallet 2's format in Notepad:
https://imgur.com/a/z9iOGFy

You can't get those results if you open a wallet.dat via Notepad. Those are wallet dump files created by a third-party software.
If those are your wallet.dat files, it's not surprising that Bitcoin Core failed to load those.

Quote from: ShyAngel444 on October 08, 2024, 06:04:38 PM

(I am not sure how deterministic wallets are different from regular ones, so I don't know if this makes a difference to another wallet.dat file)

If a transaction created in 2009 belongs to a deterministic wallet, it's highly likely that it's just edited-in there (shown not as "watch-only") just like 100% of the for-sale wallet.dat files.
You can't spend it since the wallet doesn't have the correct private key to sign.

FYI, Bitcoin Core doesn't use deterministic wallet in 2009 or even until mid 2016.