SWIM has smoked year-old spice that was just kept in a drawer and it was just fine.. I've never understood the people who say spice degrades fast... Maybe some more chemistry-oriented people can give us more info, but AFAIK the most that would happen is some spice turn into n-oxide, which is active and some people seem to even prefer it. I have read people talking about strange/negative trips with degraded spice but then again, maybe it was self suggestion?
In any case, yeah the usual recomendations for storing things, cold, dark, no humidity, airtight.. So some kind of non-transparent airtight container in the fridge/freezer is for sure good.
If the container is transparent or semi transparent, then just put some tin foil around to block light..
but as you said, if its just some weeks, dont worry about it