Hi

8-10 weeks ago, I wanted to change my wallet.dat file.
Temporarily, I sent my coins to GOX , created a new wallet.dat file and sent them back.
So far, all looks good. The question is - is it possible that there is another copy of these coins due to GOX security hole  ?
How would I know ?

To clarify my question , if I understood correctly , GOX security hole allowed people to use the coins twice once they were transacted from GOX to outside wallets (if I understood correctly)

 
Thanks for your help !