Are you talking about a small parcel, or 100kgs??? If its the allowance EK give you, then its all done through the cargo village and you go and collect it yourself. For mail you can use your work PO Box, or get one yourself at various locations are town. Your villa or apartment address for mail means nothing, the local postal service is mickey mouse.
Once you upgrade you are entitled to a villa. You get 3 choices. Sometimes you get lucky what is offered. You do not HAVE to move.
EGGW