In doing business on the internet we must rely on much more than our normal trusty "sixth sense". Some say anything less than "extreme care" is a certain way to lose money when dealing with a potential supplier (or buyer) over the internet.
The internet is plagued with resourceful criminals who will spend months building a relationship under cover of professional looking websites complete with sending high quality samples they do not actually sell. They even steal the passwords of genuine suppliers' websites. So, at times, you don't know who you are really talking with on the other end. And, these criminals have been known to set up temporary real offices to give you the comfort of a real street address and phone number when you cross-check. Or, they copy the name and address of a real registered company onto a fake website, and so on. Variations in the criminal mind are endless in sophisticated schemes to steal your money.