strange Bitcoin transaction

[schnib12]

Today, i transfered some bitcoins from cryptsy to one of my wallets, since i wanted to test which plattform is still able to withdraw bitcoins.

the transaction was 6 btc as you can see here:
https://blockchain.info/de/tx/a815506858496f17abba50e837dae2f0150fe4e3ebdb1a4e1607a6a0d95c3b8b

in the evening i had a look at my mtgox wallet and wondered why i had 6 more bitcoins.
So i saw that there was a transfer to mtgox :

2014/02/11 16:43:00    Deposit       5.99950000 BTC    
1Ms4JmatxXF5L4TLAXyKVLejdGtXHrA7AL

The point is how could this happen, since it were exactly the 5.9995 btc i got from cryptsy to my wallet.

There might be a chance that this address : 16ZkeuHJhHYhS1XF8aafTVMLsD1FGxGsFU , i sent my btc from cryptsy to, was a mtgox address.
But i withdrawed exactly to the same address some bitcoins on 10/10/2013 what you can see in the blockchain as well.

2013/10/10 21:10:14    Withdraw       43.00000000 BTC    58.58055221 BTC
Bitcoin withdraw to 16ZkeuHJhHYhS1XF8aafTVMLsD1FGxGsFU
Transaction hash

https://blockchain.info/de/address/16ZkeuHJhHYhS1XF8aafTVMLsD1FGxGsFU?filter=6


I am 100% sure that i didn't do the transfer to : 1Ms4JmatxXF5L4TLAXyKVLejdGtXHrA7AL   on my own, so there has to be some redirection.

How is this possible ?

Any explanations ?

[1714157898]

1714157898

[12648430]

Could you have previously deposited to Mt Gox by giving them the private key for 16ZkeuHJhHYhS1XF8aafTVMLsD1FGxGsFU?

[schnib12]

that might be possible, yes.

how can i check this on mtgox ?

[12648430]

I wouldn't know how to check, haven't used gox since the 2011 fiasco. It seems like the only way this could have happened though.