بَابُ خِيَارِ الرُّؤْيَةِ
وَمَنِ اشْتَرَى شَيْئًا لَمْ يَرَهُ فَالْبَيْعُ جَائِزٌ، وَلَهُ الْخِيَارُ إِذَا رَآهُ: إِنْ شَاءَ أَخَذَهُ وَإِنْ شَاءَ رَدَّهُ
Translation: A sale of an identifiable thing bought without prior viewing is valid; on seeing it, the buyer may accept or return it.
Quduri first calls the sale valid despite the buyer not seeing the thing, and then grants an inspection option.
Example: a buyer purchases a specifically identified sheet inside a closed chest. A sale may occur before inspection, with the inspection-based choice available later.
This does not license sales of an utterly unidentified or nonexistent subject matter; that is a different validity question.