How is the above website not helpful in this case though? It doesn't contain only one page. It has thousands of them, so you should have a few millions of private keys. I haven't personally checked the data thoroughly, but it does look like (when browsing a few pages) most of these addresses has received funds in the past.
i think he's asking for curated list of wallets which had txs in the past
my guess is he's trying to grab forked coins which someone might have forgot to claim