Really the chances that someone will ask a small company to be compliant are just very low. Of course if you sell something in an envelope nobody will ask you anything, the deal and the reason for this law (that I consider correct) is to address packaging waste from big companies.

Of course this law it's complex for nothing, to me, they could have just added the cost of the recycling of the packaging material into the cost of the packaging material itself, making it that only the companies producing the packaging would need to comply (so that if you buy a box to ship something the cost of recycling of the box is already embedded in the cost of the box, like they did with plastic bags at the supermarket).