Frame numbers on cube bikes

A few bikes in my area have been going missing lately and i thought it would be a good idea to write frame number down.

Im going to sound brain dead here though but i cant see it, can anyone explain where there located on a cube reaction? thanks

No idea if this is any help whatsoever, but my Stereo has it right under the BB…

I just had a quick look and couldnt see it, i was maybe been lazy i will have luck under bb tmora, thanks