Red pandas are CITES I animals, meaning they cannot be imported or exported without federal permits from the origin and the destination. CITES I animals that have been bred legally in captivity, are considered CITES II... which means the need for permits can vary widely, but not all species require any at all. In the US, the Lacey Act may prevent the transport of any endangered species across state lines unless you have permits and extensive documentation of where the animal came from.
Any reputable breeder should be able to give you all appropriate documentation and tell you any other steps you may need to take. There's only a couple hundred red pandas in captivity in the US, so the animal's entire history, and were its lineage originated, should be readily provided to any prospective buyer. At that price they should be able to tell you absolutely everything about it, its parents and grand parents. I would be quite wary if they can't or won't provide you with that kind of information.
Any reputable breeder should be able to give you all appropriate documentation and tell you any other steps you may need to take. There's only a couple hundred red pandas in captivity in the US, so the animal's entire history, and were its lineage originated, should be readily provided to any prospective buyer. At that price they should be able to tell you absolutely everything about it, its parents and grand parents. I would be quite wary if they can't or won't provide you with that kind of information.