Not easy at all; you ask the right questions however. In fact, every "side" is different & the carving began at the opening & I worked out in a spiral. I ignored the edges as boundries & wrapped the pattern right over them.
You also have it right to name the "sides" & now since you see we have 6 different such "sides", I have these names for them.
Face 1 or F1 is the large "side" with the opening you see in the photo
Side 2 or S2 is the long thin "side" you see in the photo
End 1 or E1 is the top smallest "side" you see in the photo
Face 2 or F2 is the other large "side" which is in back & not seen in the photo
Side 1 or S1 is the long thin "side" you can't see in the photo
End 2 or E2 is small "side" the box is sitting on(which of course you can't see in the photo)
The name of the print in the picture is thus F1S2E1F2S1E2.
Last for this post, the carving technique is called 'chip carving' & more specifically I used what is called a '6 cut chip'. I proceded by laying out 1 'chip' & then carving it, laying out another chip next to it & carving it, & so on round the box. 6 years of off & on carving to completely cover the box with carving.

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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter