A significant Hanafi qualification is that an unseen purchaser’s preliminary statement “I approve” does not by itself necessarily waive the inspection option before adequate viewing. This is because the option is linked to inspection.
The commentary al-Ikhtiyar also explains that the buyer may rescind the sale before inspection. Thus, “the option arises at viewing” does not mean all pre-inspection rescission is forbidden.
Example: a buyer purchases a specified item in a closed box and expresses satisfaction before opening it. That statement alone does not automatically cancel the later inspection right; a separate binding disposal of the goods may have different effects.