The approved sample is suitable, but the delivered batch looks different

If the parties considered a sample before delivery and differences are noticed at acceptance, examination begins by establishing that sample's status. Which characteristics were agreed and recorded matters. A visual difference does not always mean a difference in the relevant parameter, while matching appearance does not prove identical materials or construction. A separate question is whether the inspected units can represent the batch rather than only the submitted items.

What needs to be clarified

The task could compare requirements, the approved sample and the actual products, linking each finding to an identified unit.

Materials to prepare

The specification, technical requirements and sample-approval correspondence.
The sample itself, with origin, marking and preservation information.
Batch items, delivery documents and a record of how inspection units were selected.

What to compare

Which characteristics are documented requirements and which were merely inferred from appearance.
Whether examination conditions for the sample and delivered items are comparable.
How identifiers, packaging, findings and limits of batch-level conclusions connect.

Possible outcome of the analysis

A possible output is a requirements-and-findings table, established differences and a statement of the units and parameters covered by the examination.

Limits of the conclusions

A sample without verified provenance may have limited comparative value. A few randomly chosen items do not automatically establish the entire batch's condition; acceptance decisions require separate consideration of the documents.