I do not but that's a good thought. I would think if it was that it would be dirtier than it is...both parts when I found them were relatively clean, like they hadn't been on the machine at all, however some of metal looks like it was bent which makes me believe otherwise.
With steel parts today often not being of the gauge of yesteryear, it's conceivable to run over a large object that turned out to be mostly immovable/immutable - in which case the mulching kit loses the fight and breaks apart...overdue to remove the deck and inspect the underbelly!
not to worry, nothing time, effort, and maybe $209 won't solve
let us know the outcome of what you find on the dark side of the deck