lol if you found a seed in the stash that one node got pollinated by a rogue piece of pollen (can go like 10 miles). Or the plant hermed and he accidentally squished a male preflower letting just a LITTLE bit of pollen out. If you have a seed its pollinated, period. The seed is more like an unborn fetus that can be left in dormancy until your ready to have a baby.
Edit: I also wanna say if the seed looks light in color and is easily crushed, then it may be some sort of unpollinated seed I dont know anything about crap seeds and how they work.