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The correct term for selecting a percentage of cargo from a shipment through the back of the container is "devanning." Devanning refers to the process of unloading cargo from a container, especially when the cargo is accessed from the back, allowing for inspection or distribution of the contents. This term is commonly utilized in logistics and shipping industries to describe the unloading stage, which is crucial for ensuring that the items are received correctly and safely.

While terms like "inspection" refer to examining the contents to assess compliance or quality, and "stripping" may imply removing cargo from its original packing or structural support within a shipping context, they do not specifically describe the act of unloading from the back of a container. "Tunneling," on the other hand, generally does not have a recognized meaning within the context of cargo handling and is not relevant to this process. Thus, devanning is the most accurate terminology for the context presented in the question.