Actually trying to SE with the Serial Number on Live Support, i will tell you if it succeed or not
EDIT : 1. So, they don't see the SN is there system, it's maybe because it's not under warranty anymore.
2. JBL are always asking for a clear photo of the Speakers, headphones etc... so we need to SE ebay before SE JBL ;P
3. They are asking for proof of payment ^^
Sadly, JBL is not very easy to SE (for beginners) but it is VERY EASY to SE them if you got experience.
Your thread is still nice and thanks a lot for contributing also