TheBlueBoy

I've recently paid full price for an MSPP (TCG) in neopoints but I do not know if it's duped or not, I foolishly bought it from someone I don't know. They swore up and down saying it was in their possession before Dupe Day. Anyway, I've just got a few questions as far as it goes. 

I don't plan on selling it, but in the future I'd just like some clarification:

1) If it's duped, what's it worth in USD?

2)Is there any way to tell if it's duped?

3)What's it worth in USD if it's not duped?