Swappa is real.
Sales from users with previous sales history are real.
Other than that, use caution when buying anything used.

I'm not sure what your question is exactly, but if you're wondering more about Swappa - we are a user-to-user marketplace for buying and selling your used tech. Check out Swappa.com to browse the listings - we have smartphones, tablets, laptops, video games, home tech devices and cameras - lots of great tech to choose from! For more info on our policies, check out https://swappa.com/policies.