Wasn't asked for the FIRST PS3 (i also think mine was on PC), during the first chat (where i got my account back) i gave them the one the account has been connected to for forever as I'm on my 3rd ps3. I took pictures and will be keeping them forever after this though too lol. When i got incontact a day and ahalf later for my account id to get changed back i was asked the serial of the console my PSN was first used/created on but i reiterated all this info to them and it was smooth sailing still. I'm just hoping this really is just for the investigation and I'm not banned banned. If i knew that for absolute fact i would not worry i know who's account it is lol.
Jesus, I almost had a mild (not really) heart attack. Good to know you don't need the FIRST account.
My first PS3 died, and I junk yarded it. My first PS4 I traded in for my Pro - only like a year-ish ago. For a second I thought i was really boned. Had this account since like 2006. lol