* Condition is Everything: Even within "perfect condition," there are nuances. A card graded PSA 10 (the highest possible) will be worth significantly more than a "perfect" card with a slight crease, even if it isn't noticeable.
* Rarity Matters: The three original God cards (Slifer the Sky Dragon, Obelisk the Tormentor, and Ra the Mighty) have different print rarities within different sets. A rare "gold" secret rare version of Slifer can be worth more than a common version of Ra.
* Market Fluctuations: The Yu-Gi-Oh! trading card market is dynamic, and prices can rise or fall based on demand, new releases, and even the overall health of the economy.
Here's what you can do to find an approximate value:
1. Identify the Specific Cards: Determine the exact name of each card, its set, and its rarity (common, rare, super rare, etc.).
2. Check Online Marketplaces: Websites like eBay, TCGPlayer, and Troll and Toad offer listings for individual cards, allowing you to see recent sale prices.
3. Consult Grading Services: If you have a card in "perfect" condition, consider getting it graded by a reputable service like PSA or Beckett. This will give you a certified evaluation of its condition and thus its approximate value.
Remember: Online price guides are a starting point. You should always consult multiple sources and factor in the specific condition of your cards.