I bought a small sample size, 10x pumpkin chest, I regain back 800+ pumpkins.
There was 2 chest that net me 200+ pumpkins, while the rest was between 30-90 pumpkins.
I would say the RNG for the chest is pretty low for 1000 pumpkins.
I would consider just saving to complete the other stuff instead of the equipment sets. Most of the other 5* item set requires 4 or more pieces TBH.