He is still online, have you PMed him to come here and explain yet?

Anyway, give it a few days. If he used Registered post (Posdaftar), it will take a few days to reach your place. It usually takes 1-3 working days to deliver within Klang Valley and can take up to 2 weeks if deliver to East Malaysia.
If he use Poslaju, then yes you should receive next working day if no delay. If he use other courier company, then depends on your luck, some are good some are not so good.

If by next week you still didn't receive, then most likely kena con edi. But now is still a bit hard to say. Sometimes people are really busy or just inconvenient to go post office, then again, seller should be responsible to inform the buyer about it if he isn't able to post out immediately.