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Inspecting the last part can give assurance that nothing changed in the setup during the manufacturing run. It's expected that some equipment will be old, subject to vibration or tool wear, etc.
Comparing the last piece with the first piece can give supervisors a chance to understand how long a piece of equipment can run acceptable product without intervention: adjustments, tooling change, coolant refresh, etc.
There is no reason for preserving the first part after it was compared to the last part and vice versa. All you need are the records of measurement of those parts.
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Jan 12, 2018