Any ideas or methods to check private keys and their balance?
No. This is impossible in Bitcoin.
In case you didn't notice: that was sarcasm, because you keep creating new topics for the same subject.
Whichever wallet you say i would setup and import.
If you only want to find funded addresses, I would use something like
bitcoin-tool (in a VM) to get the addresses, and compare the list to
this or
this list. That would be the fastest solution.