وُجِدَ خَلَلٌ فِي مِيزَانَيْنِ.
A fault was found in two scales.
إِنَّ خَلَلًا قَدْ وُجِدَ فِي مِيزَانَيْنِ.
A fault was indeed found in two scales.
The unmarked report may suit an uninformed listener. When a listener denies the verified finding, inna and qad can reinforce it. Such reinforcement would be rhetorically misplaced if the inspector himself remained unsure.
Emphasis changes the way a report addresses its audience; it does not establish truth independently. This explains why initial, responsive, and denial-facing reports differ in their optimal expression.