I recently flown, on AA ticket, DOH-LHR-LAX-ORD-PIT=DCA-ORD-DEN-LHR-DOH. All segments on the inbound from DCA has been credited. But I had not seen anything on the outbound to PIT yet. I realized that we can file missing mileage claim for BA flights online. I have two questions:

1. Do I file the BA segments (DOH-LHR-LAX) online and the others on paper?
2. On the MPC website, it says to complete the form and fax together with the itinerary receipt and boarding cards. On the claim form, it says it has to be letter post to Tsuen Wan. Which instruction to follow?

I will be travelling through HKG next week, should I just stop at their airport counter to file the claim?

Thanks.