Given that the OP published the exact amount of BTC in question (0.6104), is it possible to search all addresses that contain exactly that amount in case it is only one address? Maybe it would help in some way to get some information about the real owner - although it is not clear to me why the OP has not already published this information?

Maybe he still doesn't understand the difference between an address and a private key, but after 4 pages of discussion some things should be pretty clear...