It is usually inspected for pests - rodents, flies, and cockroaches. Therefore, it is checked whether the traps are installed and whether they are inspected regularly. The external auditor looks at how the finished goods are arranged, whether the boxes are damaged, and whether the product itself may be damaged. And the third is to check whether the defined storage conditions are ensured - whether the temperature/humidity is measured, whether temperature mapping has been done in the case of a high-shelf warehouse, and whether the products are placed somewhere so that they are directly exposed to the sun.
All these situations can lead to contamination of the finished product.