Write a letter to the postmaster complaining that you have not received the parcel sent to you by your sister in U.S.A sign yourself as somebody of moon city.
Moon city,
20th March, 20…..
The Postmaster,
Moon City.
Sub : Non-receipt of Parcel.
Sir,
I want to bring to your kind notice that I have not received the gift parcel sent to me by my sister in U.S.A on my birthday.
The parcel was dispatched on the 2nd of March, but I am yet to receive it. It contained some valuable items.
I hope you will do the needful to trace the parcel.
Thanking you,
Yours faithfully,
Somebody
