I had heard sometime ago that if you needed proof of the taxes paid in HK to Inland Revenue, that it is possible to visit the Revenue Tower, make the request in person, and after a short wait (eg 15 minutes) they can produce an official statement for you.
I cannot recall who I heard this from, but wanted to see if anyone is familiar with the process. If so - what was your experience? Where at the Revenue Tower did you go? Did you need to bring any documents with you or just your Hong Kong ID card?