我也來參與, Catch 兄莫怪

To Whom it may concern:

My order number is xxxxxxx(這個地方要寫你的訂單號碼)
During our last correspondance, I informed you of the fact that I have not received my package during the estimated period of delivery. It is December 16 already and still, I have not received my package. It is highly probable that the package is lost.
Please advice.

Sincerely,

xxxx(名字)