ESB pack symbol , anyone have a good pic?

I'm painting an ESb pack yada yada yada
I need a good pic of what this is supposed to look like;

I think that it may look something like this?

I saw that in Ely's thread
Wasn't sure if it was accurate
It's an old thread and I've also seen x's and even circles in place of the squares
anyone know?

Soz bro all I had?
Hope you have more joy than I did... I'm after the same info?

I dont know how accurate it would be but I know that the kotobukia Boba Fett has an ESB pack and it does have the marking on the back.

Forcebewitya.