no postcard?

i pre-ordered the book on Amazon.jp the day pre-orders opened, but i just straight up didn't receive the little print that was supposed to be preorder bonus. did anyone else have this issue? or am i just stupid.

i pre-ordered the book on Amazon.jp the day pre-orders opened, but i just straight up didn't receive the little print that was supposed to be preorder bonus. did anyone else have this issue? or am i just stupid.