Vicious said:
according to the quote from that site "Title 18, United States Code, Section 1466A(b)(1), which prohibits the possession of any type of visual depiction, including a drawing, cartoon, sculpture, or painting, that depicts a minor engaging in sexually explicit conduct that is obscene."
Since the mail was intercepted, he never actually possessed the material at any time. Sure, he would have possessed it had the package not been intercepted, but that's not what happened - and that's what really matters. So he should be able to beat any charges for the material that was mailed to him.
Then, using that, he could argue that since no crime was actually committed, the search of his house was completely unjustified. Since the search was unjustified, he could then motion to get any material seized from his home dismissed as evidence.
If he managed that, then the prosecution would then have no case and would have no choice but to drop the charges.