Figuring out who owns the btc addresses that received the multiple 1000BTC transactions could lay in the small amounts that are also received on those addresses.
These small amounts look like advertisement amounts, so somehow someone found these addresses somewhere.
Questions is where were they found...
For example,
who owns 1FactomGnNFTsTVx8jiGjcLKDpyL65GDsH - looks like a "manufactured" address ".Factom...". This is one of the addresses that transfers 0.0005BTC.
And how about 1KBy6MvcBb2qQRS5fQT92o2c5Dq2W6ygx4, that received 1325BTC on 2014-07-29. Two days later it received 0.00000001BTC from 1NktQfw949Sv7acr3vj1WS98PPPtNBzMRb, which got funded 0.05BTC in transaction
https://www.walletexplorer.com/txid/3069a8c913c506e068743c71225ba9554e20883a9ac86b0543d93de195042d50 received from Localbitcoins.com! So who is behind this transaction?