I guarantee that you won't be x-rayed, the cost and time required for them having to x-ray every person would be ridiculous. I couldn't think of a single reason why they would do that.
Mailing is the way to go, the pen idea is great, though also just buying some local warez like pottery or something and mailing that back. i don't think souvenirs would arouse any suspicion, plus it would give you plenty of room to hide whatever is needed. Just mailing pens would be a little strange, so try something that would make sense for you to send home. Maybe buy some pens that had some foreign writing or some cool design.
Mailing is the way to go, the pen idea is great, though also just buying some local warez like pottery or something and mailing that back. i don't think souvenirs would arouse any suspicion, plus it would give you plenty of room to hide whatever is needed. Just mailing pens would be a little strange, so try something that would make sense for you to send home. Maybe buy some pens that had some foreign writing or some cool design.