1. Outside/Undercarriage - should be done prior to entering facility. The support beams on the undercarriage should be visible.

2. Outside/Inside Doors - look for secure and reliable locking mechanisms, different colored bonding material, loose bolts, plates or repairs.

3 & 4. Right and Left Sides - look for unusual repairs to structural beams, repairs to the wall on the inside of the container (must also be visible from the outside). Use tool to tap side walls and listen or feel for hollow sounds (may indicate hidden compartment).

5. Front wall - look blocks and vents (must be visible), use tool to tap front wall and listen or feel for hollow sounds. Verify internal length of container.

6. Ceiling/Roof - verify height from floor, make sure blocks and vents are visible. Verify that repairs to the ceiling on the inside should also be visible from the outside. Use tool to tap side walls and listen or feel for hollow sounds.

7. Floor - should be a certain height from the ceiling. Should be flat and NOT contain different floor heights. Look for unusual repairs