Any company spending 30k + on an automatic inline checkweigher is going to have an automatic reject attached to it that would knock the underweight product off

Any company spending 30k + on an automatic inline checkweigher is going to have an automatic reject attached to it that would knock the underweight product off the conveyor into a bin. That's typically a $1000 option on the upper end. Much less if you just use a little air jet for the reject. Or they could spend another 200k on a shiny new cartoner that doesn't kick out empties, but that might be a really expensive fix for an intermittent problem. Sometimes fixing the root problem long term is more expensive than the medium term bandaid.