I might not have much trade and post here in Geekhack,
I m a active forum member of Lowyat.net in Malaysia,
I organized a few group buy there and sold quite a lot of keyboard related stuff in Malaysia,
I would say the registered mail or Poslaju in Malaysia is quite reliable now day.
I was half joking about I sending out the key after I received it, we can send out the key together,
(now that I saw the post from dubgalore, I believe that you're a trustworthy seller)
the term that really matter is that we both keep the key for a bit of cool down time after we received the key,
before we decide the deal is closed (good).
I did not do that last time, I posted in the forum declared the deal is good, before I try out the key.
All shall be done only if you feel comfortable, if you are not, we shouldn't do this at all.
I wouldn't recommend PM communicating, we should post here if we decide to make a deal, so that other may be our witness of trade.