Courier delivery, even in the official B&O box and packaging, is not 100% successful. The glass panels have been known to break and I have had one of the sliding doors jump out of the track in transit. Having said that, I must have couriered 30-40 units by now with at least 80% success even for those travelling abroad.
My recomendation however, is always to collect in person if practical. You can judge the overall condition of the unit and thoroughly test before parting with the cash and give it a gentle ride home on the back seat of your car.