They did a double batch, so it was actually 6 sacks. My box holds one sack on eight shelves and a pound of chips burns for about 90 minutes.
They like to use alder wood chips, but I keep telling them to source the local stuff since their motto is "inherently Floridian." Citrus wood makes a smoke very similar to Beech in my opinion.
I have some photos of the smoker in an old thread.