I had this very same problem a few years back when I went to America. The customs know what to look for. But as already mentioned they have a lot more bigger things to deal with. There's always a chance. When I went I brought back the ps3 game rock band with the whole kit (guitar, drums etc..). The box was huge. I bought a really big bag and just checked it in. Landed and just walked straight thru customs no questions but afew people did get stopped with perfume bags. I suppose if you don't flaunt it and just try to to keep it to yourself.
Cheers
Cheers