True or False: The key documents identified can be used to find key documents in opposing counsel's production.

The statement that the key documents identified can be used to find key documents in opposing counsel's production is true. Key documents typically serve as critical references in a legal case; they provide insights into the arguments, evidence, and strategies involved. When reviewing a case, these documents can guide search parameters and inform which documents from the opposing side may be relevant or necessary for building a case.

In legal practice, it's common to concentrate on key documents to streamline the discovery process. By analyzing the context and importance of these documents, attorneys can better navigate through the opposing counsel's production, identifying additional documents that may be related or equally important to the case at hand.

The other choices, although they might suggest circumstances under which document relevancy could change, do not negate the foundational principle that key documents identified within a case significantly aid in locating corresponding or relevant documents from the opposing counsel. A comprehensive understanding of foundational evidence often leads to more effective strategies in handling discovery and litigation.