Have always had a problem with RJ flights - last one was LHR-AMM-BKK-AMM-LHR
The AMM-BKK-AMM flights posted fine (about 7-10 days ?) but the LHR-AMM AMM-LHR never did - after 6 weeks I had to supply booking ref/ticket numbers and stubs (NB RJ dont put the tix numbers on the stubs so keep your booking email).
I had deleted mine but luckily use Tripit-pro - and they keep the emails you send them for about 6 months.