the last transaction to this adress : 1B8XBJ3g7sNZj4AUtJ15UgcfE3waYw7pPL
big fat wallet..
OP might actually be lucky. It appears it was sent to like 3 or so different BTC address's. It makes me wonder if he/she thinks it's hiding it by going through the 3 addresses but since linked together we can see it. No mixer or anything I thought would be used was.
The final address is HUGE: 3,862.54723801 BTC . This makes me think it is linked to maybe a hardware company or exchange not a lot have this kinda of balance.
If you can figure out what that final address belongs to there is a slim chance of getting it back.