My AirPods Pro have a sticker in a part of the AirPod does that mean there fake or refurbished?

Counterfeiters tend to prefer to make their counterfeit devices accurately reflect the original device, including copying most or all attributes, and often copying real serial numbers.

This makes identifying counterfeit devices remotely near impossible, absent some egregious mistake by the counterfeiters.

And vendors are likely loathe to fully describe how they identify counterfeit devices, too.

Here? Pair it. See if it works, and see if it shows as AirPods in the Apple device displays, and has all of the AirPods features.

More generally, don’t buy from sellers you don’t trust or that are likely to disappear, and don’t buy “good deals” or unusually low prices from vendors or sellers that you’ve never heard of. Don’t buy anything from an online sales listing service for used equipment or from an online auction services offering used-equipment listings that you’re not willing to immediately recycle. I’ve seen what sure looked like counterfeit products or lost or stolen products from various online used-equipment sellers.

You have not provided enough information and detail to enable any kind of judgement. Even with a photo of the sticker it would be difficult to give an opinion, particularly when considering the many regions of the world where Apple products are available and the many local regulations and markings which must be followed.