Two pairs that look the same aren't always the same pair
Know what you're carrying.
Retros repeat. Colorways get reissued. "The black and red ones" isn't an identification.
Retros repeat. Colorways get reissued. A memory of "the black and red ones" can match three or four different releases that don't share a resale value, and eyeballing it is how a collection ends up mislabeled without anyone noticing.
Identifying a pair properly means matching it to its actual catalog entry — the specific release, not just the silhouette and colorway that's closest by memory. CYKI's catalog search does that matching for you, and where the box is in front of you, scanning its barcode gets you to the exact same place without typing a style code by hand.
It matters because the value that follows is only as good as the identification underneath it. Get the release wrong and every number downstream — cost basis, current value, profit or loss — is quietly answering the wrong question.
A style code is short, usually eight or nine characters, but it's the one piece of information that can't be reliably eyeballed from a photo. Matching against real catalog data resolves a pair to one specific release, not a family of similar-looking ones sharing a colorway name.