I have s3 diamond 1 currently and was plat s2.
i have 73 champions, and i think i only ever bought pulsefire ezreal skin and the limited edition Urf the manatee Warwick skin. I also have the championship janna skin.
I have the original email account but do not have the welcome email as it was deleted a long time ago (account was created before s1)
Im not sure what other information you will need to know.
For more information add me on skype - kingkeithlee