Flip to the front or back cover of the printed instruction manual. Publishers frequently printed CD keys on the bottom of the final page.
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For collectors, a "serial number" (often found on the back of the jewel case or in the documentation) ensures the authenticity of the item. It guarantees the product is a legitimate, sealed, or pristine first-edition release, rather than a reprint or counterfeit, which is vital for retaining value. Why Collectors Seek "New" or "Mint" Condition Flip to the front or back cover of