1) Fill up your bags so that there's no room at all.
2) Lose a BG, preferrably AV (More bang for the buck)
3) Petition a GM because you didn't get your one mark.
4) A few days later you'll recieve three marks in the mail.
I've done this twice on my Shaman, each time I lost AV, each time I got 3 marks instead of one. I only suggest you use this with AV and not the other three BG's because those three end really quickly and there's not much reward, but AV's usually last a few hours and you get more progress from three marks there.