Hi...I know how you feel but bear in mind that as long the shipping method is non trackable (normal airmail) there is nothing you can do but wait.  If the item is held by customs you will get a letter stating that you need to go clear with them or appoint an agent or post office to do for you.  If you did not received anything then your item has not arrived in Malaysia yet...could be lost or still in transit.  NExt time it is most advisable that you at least request the seller to use registered post/ confirmed delivery where got tracking but is less expensive than Express shipping.  However this is also dependable on the weight of item.

...And if the item cost below RM500 (including any insurance plus shipping) usually it will not get taxed.