Postal investigation identifying

The transcript describes a scenario where a person buys iron pipe and dynamite, claiming it's for clearing stumps on a farm. As evidence mounts, a clerk at the Pawtucket substation provides a decisive command that concludes the case.

What items did the individual buy that raised suspicion?

What was the purpose of the items purchased according to the text?

What evidence was accumulating in the case?

Who played a crucial role in concluding the case?

What was the final statement made in the text?