I was contemplating to post this is a new thread as its not about compensation but I will try here first.

We flew HAJ-ZRH-LHR-HKG-PVG on two tickets, the first two flights operated by LX, then NZ then FM.

Upon arrival at PVG two of our bags were missing. It became very clear that FM at PVG is not really helping to locate the missing bags. So we want to increase the chances of getting our bags by doing some investigation on our own.

NZ at PVG for example was saying that I shouldn't bother with FM and that they are getting their own people at HKG and LHR involved. They also recommended to contact LX but I don't have a contact yet.

Here is my question:

The bag tag has a barcode, were will this barcode be scanned? In other words, should NZ know that the bag was loaded into the aircraft at LHR? Or should ZRH airport know that the bag was scanned after arriving from HAJ? We would like to establish were the bags were last seen but I don't know the process of baggage scanning.