Question:Harvesting seeds... Length of time before they're viable?

I have some seeds that were harvested from a buddy's plant, they are mature and hardy. I kept them in an open jar and they've been drying now for over a month. 1st question is if I should seal them up or not? 2nd: how long do people typically wait after harvest before they try to germinate fresh seeds? I've had these things drying for awhile and i cant get one to pop, are they too fresh?
I've tried a dozen so far
Thanks in advance!
 
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