Nine pieces are ready. The tenth is the filler that finishes the install.
The cabinets are built. Doors are on. Hardware is packed. The truck is almost ready. One filler is missing because the original piece was damaged and the remake did not make today's finishing batch.
On paper, the job is nearly complete. Operationally, the crew may still need another trip, another loading slot, another coordination call and another interruption to remake the missing part.
The cost sits in the unfinished chain, not just in the value of the missing piece.