Firstly, I really commend the amount of effort you’ve put into this 👏
Secondly, I absolutely LOVE this idea and would welcome cards as an additional collectible. I am one for collecting boxes and still have all my Nothing product boxes, for the reasons you explained above. Also, as a Pokemon lover and collector, the idea of having cards per product resonates well with me.
The idea actually made me think of a food product that I buy for my kids - Yo-yo Bear Snacks - which are fruit strips in a pack. With each one, you get a collectible card featuring characters and QR codes, that you can scan to collect and go on adventures. Some examples below of this for those that do not know what this is.
