Here's a quote from the first reference:

"A poka yoke device is one that prevents incorrect parts from being made or assembled, or easily identifies a flaw or error. poka-yoke - 'mistake-proofing', a means of providing a visual or other signal to indicate a characteristic state. Often referred to as 'error-proofing', poke-yoke is actually the first step in truly error-proofing a system. Error-proofing is a manufacturing technique of preventing errors by designing the manufacturing process, equipment, and tools so that an operation literally cannot be performed incorrectly."

Poka-yoke is Japanese for mistake-proofing. These devices are used either to prevent the special causes that result in defects, or to inexpensively inspect each item that is produced to determine whether it is acceptable or defective. It was devised by a Japanese engineer from Toyota.

So I reckon from your context that during this magazining (I don't think it's storage), the process is designed in such a way - by mechanical means perhaps - that error is impossible. Perhaps a laser that detects flaws and rejects defects automatically?