If OP found some smart way to capitalize on old addresses, good for him.
I've just seen this thread: old Bitcoin addresses as 'NFT' on the Bitcoin blockchain - 'signature chain' - I don't profess to follow it at all. However, now I'm wondering if the OP is going to be a pioneer of utilising the ETH wallets?
Not 2021 wallets, no, not ever. Try 2015 ICO wallets for that at best (in about a decade). Those referenced BTC NFTs otherwise have 0 volume, no floor price nor listings and 1 owner
DYORSuch interest, such value, much wow. If you're able to sell an old empty ETH address for $, then go for it imo.