(Warning, this post contains swearing.)
As an exchange of favors, I sent a valuable camera by UPS, a Canon 5D Mark 1 with an expensive zoom lens (collectively worth maybe $2000), to a friend in the Ukraine. I included a letter which made it clear that she had not paid anything for it.
When it arrived, Ukrainian customs told her that they needed an invoice to give her the camera. So I wrote one for her.
Later they told her that the invoice was wrong, it was a different camera, and a 18-55mm kit zoom lens. She told me to write an invoice which did not mention the specifics so much.
And today she got the parcel, after over a month... it contained an old, super-cheap Canon camera, with a cheap kit zoom lens. [Update: and it's even broken, I am told now. And they made her pay $200 in import tax for a broken camera!] It did not contain the camera I sent her. They fucking stole the fucking camera and the lens! I can't fucking believe it.
And I don't even think there's anything she can do, in practice. Even if she can, it will surely be a lengthy and exhausting battle which ain't worth it.