I have obviously never shipped or received anything like this but I have heard that if you:
1. Use a Seal a meal and vacuum seal your item.
2. Put that inside a zip lock freezer bag (use only the thicker freezer bags)
3. Smear yellow mustard all over the zip (vinegar & mustard mask the odor really well)
4. Put that into another zip
5. Smear mustard over that zip
6. Put that into another zip
7. Put that into a 3 or 4 inch dia. by 12 inch long PVC pipe with screw on caps glued on
8. Ship UPS ground (UPS leaves pkgs. at my door with no sig required)
9. If they come up with a BS signature required story, they caught it, dont sign, just say that you didnt order anything.
10. Use disposable latex gloves and discard between each step.
11. Call me to come over when it comes in, lol
Seriously, what I have heard is that if you seal it up and ship it quickly, the odor doesnt have time to get past the mustard and permeate through the PVC. In the rare event it is X-Rayed, it doesnt show up anything because they are mainly looking for metal and wires and such. A dog would more than likely walk right past it but again, if they ask for a sig, you know it was nabbed.
Its a PITA but thats life behind the Iron Curtain.
If anyone here knows differently, please correct me. S