Maybe it's a language barrier thing here ...
But we agree: They are not selling the USB stick and the mp3s. They are an added bonus. However, so far the only way of getting those mp3s is to buy the guitar. So, I don't know. It sucks big time any way you look at it.
https://legendsseries.direstraits.com/The word "bonus" is not used at any time.
They are selling a package containing the following for £247.50:
BROTHERS IN ARMS EDITION
Limited-edition 1:4 scale replica National O Resonator guitar, nestled in an embroidered guitar case
32GB ‘Brothers In Arms’ engraved USB key, which includes ‘Best Of’ recordings from the Brothers In Arms tour.
Frameable 3D Brothers In Arms 8″x10″ print
Brothers In Arms Lanyard
Brothers In Arms Laminate
Brothers In Arms Retro Pin
Guitar Display Stand