One parcel in a batch always looks doubtful. The useful question is not whether the order feels risky, it is what this same person did the last four times you shipped to them — and you already own that answer.
The lookup lives in the workspace Premium panel, so it opens once your wallet has coins. It costs nothing per lookup — the 1 coin per label charge applies to the crop, and only when a premium option is switched on.
Identity is name plus address line 1 plus pincode, normalised — not the order ID and not the name alone. A tolerant second pass forgives the small OCR differences a scanned label produces in a name or a street line, but the pincode has to be equal either way. So the same repeat buyer still lands in one history when the spelling wobbles between orders, and a different household in the same pincode never gets folded in.
Only your records are scanned. A buyer ordering from you for the first time has no history here and a suborder ID that is not in your label data comes back as not found, rather than showing you somebody else's customer. That also sets the limit honestly: what the page knows is what you have cropped and settled.