I think it originated with the cluster computing use of Digital Equipment Corporation VAX computers. (Standing for Virtual Address Extension, a virtual memory scheme) A server room full of these (And they were usually big, so think of half a floor, not a plumbing closet) might be refered to as a herd of VAXen. When cheaper more commodity hardware Unix machines came along, the term boxen from Unix Boxes > Unix Boxen came into currency.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
Back to burning cardboard etc...
Waxed cardboard make a great fire starter.
One match and away you go.
The old log rollers were also a good gadget.
Wet newspapers and roll them on a hand spool as tight as you could get them. Let them dry thoroughly and they burned damn near as well as logs which is hardly surprising since they ARE basically logs.
My job when I was a kid. Hated every minute of it too.!