A guy just came and took away all our used boxes from the move. I connected with him through freecycle, an organization I first ran across in Paris. The idea is simple - if you have something you want to give away, you post it to the list. Someone contacts you and says 'I'd like that!' and you give it to them. It's worldwide, so anywhere you are, more or less, there's a freecycle. Australia & NZ, Europe, North America are all well covered. It's a good system, and if you aren't already on it, you should consider joining one, if only to get rid of all your old stuff.