A void may make a pack-out different from a validated full load. Check whether goods move and what point the record represents.
Record what you see
Use a fill line or photo to document the void, product layout and coolant position.
Compare part-loads
Trial different loads in the same box; record closure, movement and measurement location. Do not assume a fixed effect from empty volume.
Choose a repeatable setup
For recurring part-loads, compare a divider suitable for the product and model instructions with a smaller box under the same route conditions.
