This Yugi & Seto Kaiba - Structure Deck Display (1st Edition) contains 8 Decks in Total
The full video shows lots of other examples, but the difference between a real card and a bootleg really ranges between "blatantly obvious mistake" or "almost imperceptible difference from the original"
Thickness of 1 Side (microns): Vault X Exact Fit (60), Ultimate Guard Cortex (105) 100 Double Sleeved Card Thickness (mm): Theoretical (63), Practical (68) Water Test: Pass Deck Box Fit (mm storage): Fit: 64 good, 36 bad
TCGplayer is a strong raw-market signal, but Card Value Scanner is the better default workflow for checking the card first, then reviewing pricing sources with condition and variant in mind
This trend has been ongoing in Japan for decades, but dwindled worldwide
If it doesnt, that player puts it on the bottom of their library