A Final Random Inspection is performed mostly when 100% products finished, and at least 70% products packed inside the master cartons, and ready for delivery.
It is an industrial standard inspection way to inspect the finished products before shipment, it is mathematical & statistical way to check the product quality level is generally acceptable for delivery.
As one of the final product appearance, conformity & functionality check of pre-shipment inspections, the inspector will statistically and randomly select some products, sample size depends on AQL sampling procedure, and check for: quantity, assortment, marking, packing, functionality, performance, durability, overall appearance, and dimensions etc.
Final Random Inspection is the most common inspections in preshipment quality inspection (final acceptance inspection). Most on-site quality checks are supposed to be done by the in-house QC of the factories, and the final inspections are to validate the factory's in-house quality control, so the buyers don't have to do 100% full check. So it is a cost-effective and efficient way to make sure the product quality is up to the industrial acceptable level.
The factory should recheck, replace or rework on the products if they fail to pass the Final Random Inspection, to improve the quality level. So they won't be so many complaints when the products reach the end users.