How did you go from this:
You shouldn't use Electrum to import 200k private keys. Bitcoin Core will probably have problems too. Just convert them to addresses, and compare with all funded addresses or all addresses ever used.
Back in the summer of 2009, I downloaded Bitcoin and mined very briefly.
To this:I have 223517 private keys that I imported, which, seems excessive. These private keys were in HEX decimal format that were than converted to WIF format and thus bulk imported into Electrum. Electrum is taking its good ol time synchorizing these private keys. In this process, is has recorded 2421 transactions the first ones occuring in 2011. So 223517 private keys and each one has a unique address. It finally verified an address with transactions, though, the balance is 0.
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If view details of the address, I can view the private key in its correct format. I guess my question I wonder is, if these, weren't my addresses or private keys, how would I end up with them on my hard drive?
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Is it possible when downloading Bitcoin Core and the ledger that the scan program had gathered some of this information of other people's addresses?
Bitcion Core doesn't save "other people's private keys". It sounds like you've downloaded some known compromised private keys.You shouldn't use Electrum to import 200k private keys. Bitcoin Core will probably have problems too. Just convert them to addresses, and compare with all funded addresses or all addresses ever used.