Buy one pack as "proof" that your plants are legit (keep packaging and receipt), and when they ask why you have so many seeds, just claim one of your plants hermied and produced all the seeds in your possession.
This only works if you don't have breeders packs of "illicit" seeds in jars in your fridge.
The solution to that is to put all seeds in generic containers and number them, then keep a spreadsheet of what numbers correspond to which strains on your PC (on an encrypted drive, if you want to go that far). Cops ask what the numbers on the containers mean and you claim you graded them for seed quality (colour, size, etc.)
Only genetic testing could ever prove they are illicit seeds, and they'd never go that far for some guy growing 4 plants at home.
By the way 1 seed = 1 gram of dried flower under these new laws
For example, in BC the home possession limit is 1000 grams. If I have 500 seeds, that means I can only have 500 grams of dried flower.
So, be careful with seed production folks. An 8 foot tall outdoor plant that goes to seed could easily put you in jail with 10s of thousands of seeds equaling that many grams of weed, in the eyes of the law.