From my experience ordering few items from US using USPS.It will probably arrive this week unless your item is held by Customs..

If you have tracking number, usually it'll update to reflect the hold up by customs. Last time, I ordered a pen and since it's a pen, I didn't waste any money to pay extra for tracking. After a month, I check my eBay list of bought items, I realized that the item is not arrive yet. I contacted the seller and he said the item was returned to him. He posted a picture with customs stamp saying "Tidak dituntut". So to be on the safe side, just go and check by yourself.

Poslaju will sent you a letter.

Usually when I bought items from US, it's around 3-4 weeks.

BTW, use this URL to track your item. Click "Select country" if you want to track once it arrived here.

Track EMS

Record Not found LN300230599US
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It's because your item still in US I think. This is the last update. Or maybe you should call Kastam on this.
LN300230599US    First-Class Mail International  Processed through USPS Sort Facility  July 07, 2012, 9:45 am  MIAMI, FL 33112  International Le

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Added on July 24, 2012, 12:29 amHere is sample of my item. Pos Laju still using the same tracking number my seller provided.

View Status PosDaftar
Reference Number: RN399605839LT

Date                  Remark                                                                  foreign office
23 July 2012  Delivered at (680002) CAWANGAN SERAHAN AMPANG LITHUANIA