"Ask for 2 full days refund"? what do you mean by that? Is it on CL or something? If I was selling it, and you asked me that, I'd tell you to go **** yerself. I wouldn't even sell it to you if you had the money!
You should be able to tell if it's "trashed" as soon as you take a look at it. You will(should) know pretty quickly if it's something like a BK, or someone trying to pass off a Thruster as a BK.