I buy and sell thousands of cards and the amount of fakes are really high . So here are a few pointers to stop you wasting your money !
1, If you buy from a market 9/10 times the packets are fake only buy from official Konami dealers always ask them first before you buy .
2, When you get your cards you will notice a small silver or gold hologram in the bottom right corner this should be straight and inside the border..
3., Under the picture you may see the words 1st Edition these words will not appear if the hologram is silver only if it gold .
4, The card may have shiny writing in silver or gold and if you are lucky a shiny picture too! But it will be only be in these areas and never will the whole card shine .except in very rare cases
5, If you are unsure what cards are in each packet or you would like a price guide try yugico.com
I hope this helps