Since it's operated by SF Express you should contact them for a quote:
https://www.hongkongairport.com/en/p...ourier-service
For enquiries and the full list of courier services and fees, please contact SF's enquiry hotline +852 2929 2929 (press 3) or the service counter's direct line +852 2759 8121 (08:00 - 21:00 daily).