In July, I helped a friend create some geocaches that she took home to Belgium. A couple months ago, I helped with a couple more caches that she planned to take home at Christmas time. One of those involved a plastic ammo can with a doorbell, and another was a maze cache, both based on concepts by a local geocacher.
When she picked it up, we chatted about possible TSA questions. I didn't glue the collars on one end of the cross pieces so that it wouldn't take up as much space and so that would be easier to inspect.
Now that she's through security, she should be good to go.
Here's hoping that geocachers in Belgium appreciate their Christmas gifts from the U.S.