I can't help on the US customs but can agree with the comments on speed.
I ordered a USBEE DX (Don't tell Dave, but in my defense it was before I saw the Video Blog he did on the subject). It was shipped via China Air to Hong Kong, then dispatched to South Africa.
3 weeks ago according to the tracking number.
Rather than a Currier Service I think it ended up on the 'Slow Boat to China', either that or it is stuck in South African customs, but the Tracking site has not updated in 3 weeks.