Last transaction was made on 2016-01-21 and I guess the other sent fractions are just tested for burning. Do you know on who's this person or where did you got this address? That's a lot of bitcoins computing 9,000 BTC * $13,460 = it's a shining $121,140,000.
https://bitcointalk.org/index.php?topic=782.5This is the story. It sounds like it was a very easy mistake to make back in the day. These days we're spoilt for choice in terms of wallets and the protection they offer. Any one of us might have made the same balls up.
This is a bad story. The owner might be gone mad and became insane because of this. so unfortunate.
I hope they can still find a solution for this simple problem.