Glad it arrived fast and in good order !
You are one of the guys that where lucky to have a sticker that was on the testsheet that i could save, thats why you got 2

Becarefull to remove the protective foil though when you are going to install them, they wrinkle fast if you dont look out.
its real aluminium remember, not a regular sticker..
The printer gave the advice to install the CPU with a waterspray, and then squeez the water out with a squeegie, or something simular.
i have the idea to use this :

Its stiff plastic, with a soft edge (ofcourse, otherwise you damage wallpaper... duh.. )

you can cut off a small strip of the art and practice on a piece of plexi... thats what i will do though..
the holes i would cutout later and also trimm the edge with this :

about the square holes, they are based on 4mm carriage bolts which are dificult to come by.
the originals are 4 mm though, so i dont know if you got those ?