I hope you don't think I'm bagging on you. Was just giving you a heads up.
1st tip off was that they only made 350 pairs of the Mcfly Hyperdunks and you bought them for $100. These NIB are about a $1800 pair of shoes. I've seen used ones go for around $800.
With the pics you put up and the condition they are in I would put them at around $400 if real.
The stitching on the back is pretty bad(gap in material) The blue on "Nike" is too dark. Its supposed to be the same color on the midsole. The color on the midsole looks off too, almost a greenish tint instead of the powder blue they are supposed to be.
Some knockoff manufacturers missed a pretty important feature on this shoe. They glow in the dark. Newer versions(within last 3 years) they started adding the glow in the dark to the knockoffs.
That's just the things I saw on the outside of the shoe. Inside would tell more.