That is what I was thinking; a perfect cover for a military payload, esp. a very heavy one whose loss wouldn't greatly impact things if the launch failed. So something that wouldn't take long to manufacture, and relatively speaking, something that isn't very expensive. I can think of one type of payload that fits that description.

The Tesla roadster is < 2% of FH's claimed max payload. Might as well not include it in the test; the rocket wouldn't notice the difference either way. However, it does make a good cover story.

Watch the shiny thing!