job i did the other day, 4" pro floors in a bathroom & ensuite Job shouldve been 3 boxes easy, ended up using nearly half of a 4th Just gobbled it up, and i was using every waste cut too with the gilly
One of the boxes probably had a hole in mate and you were losing tiles as you carried it from the van?
Partly my fault ,but i thought it was straight lay untill a couple of days before fitting !! So i was panicing a bit . Had the gilly so i had to use every bit i had. 4 planks left