If I understand you right you suggest individual casings and not individual packaging (which is thrown away). The challenge would be to find a method to produce individual casings. Given the fact that our current “simple” casing has expensive setup costs, I don’t think an individual casing with an undefined manufacturing process is realistic.
Instead an individual throw-away packaging may be an option. Still its a challenge to find a practical and secure method. Practical: It should be simple enough that it can be produced and applied in a few minutes maximum. Secure: Just the fact that it is random doesn’t make it secure. It would need to be “pentested” thorough by experts - and this is not our expertise so we would need to find somebody.
My idea was to select a packaging which has just one “opening”. So not a carton but maybe a special plastic bag. The goal is to secure only a single opening. This opening is secured with a “seal”. The seal could be glittering nail varnish or the one from your video. We take a picture of the packaging and send it it to the customer. The entire method should allow the customer to verify that the packaging hasn’t been opened. If you have a practical idea for this, that would be appreciated.