Cottage Living Bonus Content
(from Pre-Ordering Cottage Living)

Those are custom versions of the bonus content that players could get for pre-ordering The Sims 4 Cottage Living back in 2021.

Since there's no way to unlock the item, like with the rewards from recent live events, I've set it up so that if you put down a lot that contains one of the original items, but you're missing them, the game replaces them with my own custom ones as fallback objects.