Hey!
With your post I now realize there is something unclear in the way we display image sizes
When we say "A4" or "A3", it only means that these images will fit inside A4 or A3 paper.
So, if you take one of the biggest boxes here, let's say a SNES box.
It's size is 10,63 x 12,67 inches.
So, a SNES box will also fit on a 11 x 17 inches like you can find in your country