Help with validating account to my mail

[N0re]

Hey guys, so my problem is as it follows:
I had access to an old account whose the owner didnt and doesnt use.
So I decided to use a e-pvp tutorial so as to register it to my email.
All was done at order and I sent a ticket to riot and I managed to take the account to my possession.
The problem is that the owner somehow (maybe a friend of his didnt see him in the friendlist as I had deleted all friends and told him) a day tried to log in and couldnt and sent a ticket to riot and took it back
Now I have re sent a ticket to riot for the account as the owner doesnt log in and wont log in, as far as I know. and they ask me for the info (creation date, champs , etc) which I know all but they also ask me for ip address.Which ip address can I give so as they wont know that I m not the original owner?Also which is the best program to check the first champs bought etc so as to be sure?
Sorry for the long post, I was wondering you guys can surely help me as you have done this before lots of time, I guess
Thanks!

[Nayunh]

#moved