The only time I ever had a large piece like that missing, it was pretty clear (on afterthought) that the box had been opened in the store before I bought it.
And I've had to return a set or two to Amazon because they'd clearly been opened and returned (and usually all the minifigs stripped out).
Understandable. I am pretty selective when it comes to a kit. Dare I say autistic? Box condition is a consideration, along with down to how I open them. It's noticeable.
And I've had to return a set or two to Amazon because they'd clearly been opened and returned (and usually all the minifigs stripped out).