The sign for
"box" uses flat hands to show the sides and then bent hands to show the
front and back of the box. I tend to use my non-dominant hand as the
outward side of the box and my dominant hand as the side nearest to my body,
but it really isn't an issue. You could do it the other way. The point is to
show the sides and then front and back of the box.
BOX:


Note: The sign BOX can also be interpreted as "ROOM." While it is true
that there is an initialized form of the sign ROOM that uses "R" handshapes,
it is not necessary to initialize the sign when the meaning "of" room is
clear from the context of the sentence. For example, see
BEDROOM.
Also see: ROOM