Hrm...
Well... You might have to ask him which postal service he used,
might not be singpost... Another reason could be like what you
said, that the information hasn't been updated yet... It is a
weekend now, and usually the post office only opens for a half day
on saturday... Try emailing him to ask him about it...
Don't worry too much about it, I've seen jacky packing models to
send out before... If he's said that he has, then he should have...
Might have to wait till Mon to check the tracking number
again...