Hong Kong Property and Banking ad cards (set of six)

It really is very hard to know what to make of these. They come from PR China, not Hong Kong, and were issued in 2015 by China Post with pre-printed postage. The scan shows the fronts of five and reverse of one card. Now, the lead card in the scan–the one saying “HongKongHomes,” is not showing a picture of Hong Kong. Some cards have Hong Kong contact numbers; some have PR China numbers; and some have none at all. Very odd. We have six of these sets available, all unused. Grades: 1