So when going through my deceased uncles estate, I found a list of many hexadecimal numbers. They all are grouped with 64 characters. As this is the base for Bitcoin and I know my uncle was doing a lot with computers many years ago I was thinking it could be worth checking out.

Converting the hexadecimal to uncompressed and compressed wif was of course not an issue and using "importprivkey" and "rescanblockchain" in Bitcoin Core also easy.
After a full rescan in Bitcoin Core 25.2 the result was nada, zilch and nothing! Most likely these hexadecimal have nil purpose, but as I knew my uncle and he would not have saved this paper unless a good reason (unless he wanted me to chase ghosts!) I am starting to think that maybe Bitcoin Core 25.2 is to new.
To be sure to scan for early bitcoins (based on uncompressed keys) which Bitcoin Core version is the latest to use? Will Core 27.1 work? Or should I download an earlier version, if so what would be best?


Due to the above I have really been trying to read up on this subject and there is a statement in the release for 0.17.1 that makes me think there could be an issue with the database:
"Note that the block database format also changed in version 0.8.0 and there is no automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading directly from 0.7.x and earlier without redownloading the blockchain is not supported. However, as usual, old wallet versions are still supported."
I do think this does mean the rescan will work, however with all the changes that's been over the years is it possible that scanning through the first years using a recent version might miss something?

Thanks.