If you sent it via USPS, they have up to 30 days to deliver it. If after that you don't receive it, make a claim with the post office. As far as other carriers, you should have gotten a tracking number in your e-mail that you can use to determine where the package is. If the carrier lost it, make a claim and the carrier should pay to re-order your stuff. (Happened once to me with UPS- they were great and even gave me free next-day shipping. Very good thing since it was the day before x-mas and I needed gifts!

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I've ordered from SVC before and it was as smooth an experience as could be. Their prices on modding stuff are excellent.