Hi There Hiker,
Firstly, if you got the green beans from Coffee Snobs then I suggest that they will be about as fresh as you can get for green beans, so up to 2 years is possible if you have a cool, dark, and low humidity/dampness storage area/container.
Personally I keep mine in an old metal trunk under the house with a container of damp rid inside the trunk to minimise the dampness that we get down here in Tassy at this time of year.
I have read some CSs are keeping them in all sorts of places like any spare wardrobe space inside, so doesnt seem to be that critical.
Im sure somebody else will have some other good ideas.
Apart from that, I dont plan to try and keep my beans for too long, I tend to turn them over within a couple of months.