Transaction db.log and sweeping keys

[mjn808]

I had a friend of mine introduce me to someone who ask me if I could help him get his crypto organized from his flash drive and so said sure, now before I go into this we have established a chain of custody and the flash drive was inspected by myself only and offline. It contains from what I see a Greencoin folder which as I noticed by looking online is worthless and not even being traded there is qrc_bitcoin.cpp and the Greencoin folder contains database and txleveldb folders along with ,lock, db.log,debug.log,pat-pw.txt and peers.dat file now he wanted me to help him look for bitcoin private keys but to me it looks like a greencoin wallet backup I did try to sweep keys using electrum and no luck as well a greencoin to important but i dont have any progress on that either so I am asking how can I look for any coins on this wallet ?

[HCP]

If you have keys, you can try sweeping them into a multicurrency wallets like Exodus or Coinomi etc and see if they find anything... but based on the information you have provided, it honestly sounds like there is nothing to find...