Agreed. Pluck one off. If it just squishes without resistance, it's just a mature swollen calyx. (no seed) The hard shell is one of the first parts to develop on a seed, so if it's seeded, it will not crush easily. Also, if the calyx is already seeded, it will not have 'fresh' pistol's sticking out of it. There's no room in a calyx for twins, so producing fresh pistols (the hairs that catch the pollen) would be a waste of the plants valuable energy.
Another way to tell...seeded calyx's quickly develop a light yellow racing-stripe from the fat end down to the pointy end.
