There are ways to circumvent the authenticity guarantee.
Per eBay's website (under FAQ):
Quote:
Your single card must be listed in the correct corresponding category to qualify for Authenticity Guarantee:
CCG=183454
Toys & Hobbies>Collectible Card Games>CCG Individual Cards
NSTC=183050
Collectibles>Non-Sport Trading Cards>Trading Card Singles
STC=261328
Sports Mem, Cards & Fan Shop>Sports Trading Cards>Trading Card Singles
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If your purchases weren't classified under "Trading Card Singles," then that might be the reason.