In reply to misterfrogfish:
Make friends with a BMG or somebody who has an apartment out there and ask if you can keep them in their kit room? Ask the campsite owner nicely and bung them 20 euros. Or just bring them home, harden up and get out in the British winter.
"Storing" them somewhere outside is a nice way of losing £150 worth of kit and having to replace it at Chamonix prices next year.