I recently sold my Quinny Buzz and am at a loss as to how to box it up for shipping. I've got a box that fits the carry cot but the actual chassis and chair bit are presenting a problem. Ditto the car seat and 2 easyfix bases. I measured for boxes thinking I'd pick them up at Staples but nobody seems to sell boxes big enough . Any suggestions? I want it to get to its new owner undamaged.