As you obviously know, coffee is a perishable product. Once it’s been roasted, the freshness clock is ticking, so the best strategy is to purchase however much you’re going to drink in the next 2 or 3 weeks.
That’s not practical for everyone, however. The next best thing to do is take those extra bags, put them in a heavy-duty zip lock bag, and stick ‘em in the freezer: the colder, the better. When it’s time to drink your stored coffee, pull out the still-sealed bag and let it come to room temperature before you open it. The wrong thing to do at this point would be to open it while it’s still cold because condensation would form on your coffee, which is not a good thing.
Oxygen, light and heat will all wreak havoc on your coffee, so store it in an opaque, sealed container at room temperature and it’ll keep fresh for a few weeks.
The tendency for a lot of folks is when they find a really great coffee, to set it aside for visitors on special occasions. I understand it, but it’s not the best approach. Sometimes, the most special things are fleeting, so enjoy them while you can. Look forward to discovering a new favorite coffee, it’s out there!