are you aware of what it means to "burn" bitcoin? It's simply putting the coins in a wallet and destroying the keys.

For all we know, these coins have already been "burned"

No, burning is sending coins to an obviously unspendable address.

that isn't possible in bitcoin - there are no "obviously unspendable addresses"

like I said, the best you can do is burn the private keys, but that isn't verifiable - you can't prove something doesn't exist