what are the most valuable yu gi oh cards?

have a shoe box full of them that are about 8 years old, was wondering if any of them might be valuable. got a couple cards with some Asian writing on them, not sure if that matters, lol

 

As far as im aware, there aren't really that many valuable cards out there, and the ones that are have to be in perfect condition and first edition or have an E by the card number i think, can't remember too much as i haven't taken notice of yugioh for a long time now, i looked some of mine up and the most people were paying on ebay were £5 lol most were selling for £2 or less though, there probably are some very valuable cards, but not many.

 

There was one card that forbes recorded that sold for like £300k ...

Research it, because I only remember seein it in magazine and that was it

 

I believe the one you're referring to is a one-of-a-kind card specially made for a kid dying of cancer.

Cyber-stein is worth around $500.

 

Heres a website i found
http://yugioh.wikia.com/wiki/Forum:Most_expensive_card?#The_most_expensive_Yugioh_cards_Recorded

I don't like the way it has been written though.