I used to live at HK, Milan statin and Paris station are famous 2nd hand bags/ clothes reseller at hk. They also have brand new item for sale too. Usually customer will purchse the bags/ clothes from europe which is much cheaper than the rest of the world and re-sell the milan station for around 10% profit and then they re-sell to the public. from what I heard. they will pay you around 53000HKD-57000HKD for a brand new birkin 35 ( depends on leather and color) , then they will resell for around 70000 +. So if you purchase your birkin from europe it will only cost you around 50000HKD or less after the tax return, its quiet good profit.
for LV handbag, they will either pay you from 10% above retail price to 30% off retail price for a brand new bag ( based on HK retail price) lotsss of ppl purchase popular model and resell to them.
Gucci/
prada/ chloe are not as popular as before usually they only will take the bags within 1 year.
I will go to HK at July, I hope I can find my dream magenta Balenciaga from those 2 store since balenciaga no longer popular at hk, so the resell price should be cheap.