we too are a food packaging manufacturer.
We have a list of users and their ID numbers.
Each knife has an owners ID number engraved on it (rough carving with a sharp tool , wearing gloves of course)
We issue the knives with our rules and training .
The operator signs to acknowledge receipt of knife, training, responsible use and compliance.
Each time the operator takes his knife from the tool box he inspects it and signs to say its ok. In good order.
At end of each shift he replaces it back in the tool box and signs to say it is still ok.
Blades are stored in tool box in a safe dispenser, not loose.
Yellow bins are at key areas for immediate disposal of old blades.
Any loss or breakage is treated as an incident, investigated, pieces looked for and recorded on an incident form.
Hope this helps :)