Ok, not for anything but if customs took it he would have received a letter stating that the items have been seized and exactly why they have been seized.
I worked in shipping for a few years and it actually is quite common for packages to go missing or get destroyed in the sorting facility. It can take 4-14 business days to pass through customs, it all depends on the work load of customs, and keep in mind it is the Christmas season so surely there are packages everywhere.
I would contact the sender and ask them what their re shipping policy is.