So what? Keep it in the box to make it mint condition, and you can have a higher value to your Funko Pop. Funko Pops ain't toys you know, they're collectables
You'll know for next time. I learned this pretty early on when I got my first Funko Pop around 8 years ago. I still have that same Funko Pop to this day and I'm hoping to sell it. I'll post an image of it sometime this week