If I understand correctly OP is asking for private keys of wallets that currently doesn't have any funds in it, just wallets that had balances in it last year. As far as I know wallets like this can be used to claim airdrops. Though yea, I think this probably shouldn't be allowed here.

this is possible also i am thinking that if you give your privatekey that have balance before they can also claim the free coins from fork before if the owner doesnt claim it at this moment.

There are no persons can give thier privekey to any one without an exchange even the wallet doesnt have any balance.

Are you participating in some kind of tx puzzle?

"Found and wiped" sounds like somebody is brute-forcing the private key of a known address and then move the funds in it.

The private key is one of the most important key in your account and I'm doubting about your topic because it is getting the list and that is the related key and this is you just need to store and most of the platform today are recommending to not give their private keys to other users because this is the key to use for recovering your wallet and at the same time getting the account safe to the hackers and other people trying to attempt stealing your information and coins. And if you want to get a private key you need to create an account to the platform does require for having kyc or verification to their users because most of the time this is needed to secure the login process and transferring of funds too.
Also in the previous year there are a thread here in bitcoin talk giving the list of the private keys but it does not contain any coins and that is the generated private keys and he just want to make more explore about the thing of private key too. Try to check this thread too if you are the same hobbies as him. https://bt.irlbtc.com/view/4345245.0

I am sure he meant private key and there can be only two reasons why someone would ask for such information:

1. Either to claim forked coins which I don't think anybody will leave before making private key public.
2. Or to personify as the holder of that address and make more transactions. People have used this method to show proofs on Bitcoin Doubler Scam sites in past.

Except those two reasons if OP genuinely needs used private keys for educational purpose then he should better ask his query on forum to get easy answer rather than trying to figure out himself through private keys.

Well there is one popular private key available in public domain and had some prior transactions on associated Bitcoin Address which is:

Private Key (WIF Uncompressed): 5KUN8s42BCTkQVMTy3oFfqeXE8awVskbDi6XbDMpRnFvHJW9fgk
Bitcoin Address: 1ADJqstUMBB5zFquWg19UqZ7Zc6ePCpzLE

This is a private key generated with the hex of English word 'satoshi'.

I don't have an answer for you, but these might be interesting:

Collection of 18.509 found and used Brainwallets
Large Bitcoin Collider (Collision Finders Pool)
Large Bitcoin Collider Thread 2.0

ithink someones hacking op's wallet and force his private key to break. thats ithought his mean. its hard to find someone's private key unless you give to them. and no one can bypass of this.. be careful with your private key..

even after clarification i was still like    

cause i thought he was speaking from the perspective of a victim whose wallet had some kind of time/date tech error bug (ala y2k cpu errors)

but then i noticed that this guy hasn't posted AT ALL since

i mean are you assuming that everyone here is scamming in the crypto scene and want to brag about wins?

cmon bro

Under no circumstances should you enter any of your private keys into any of those sites. With a private key, the site may steal the bitcoins held by that pivate key.