Why do you think that you'll be able to locate the owners of those wallets? How are you sure that those wallets contain Bitcoin. If I'm not wrong then you have wallet.dat files of those wallets and from those wallet.dat files you can't really know how many bitcoins they contain.

How could you possibly know that who's the owner of such wallet.dat files and how can you locate them if you don't know who they are? I'm not bullying you and I don't really bully anyone but I smelled a kind of scam and that's why I said that. Are you sure you haven't been scammed by someone else who sold you those wallet.dat files?