Shhhhh. Have you heard? GSA ali panniers arrive at the dealers with keys already supplied.
When the dealers fit them to the customers new bike, they get recoded and the old keys are surplus.
Consequently, a certain dealer in Herts might just happen to have a large box containing hundreds of unused keys which they dont ever use.
That certain dealer might just let you take your top box into the shop and, over a (free) coffee, try each key innthe box until you find one that fits.
Then they let me have it FOC.
(It only took about 30 keys before I found one to fit the panniers on my new keyless Triple Black GSA)
but dont tell anyone else or they'll all be doing it.