Client gives notice to attorney of potential issue. Later, some tangible item such as a document causes emotional distress / mental breakdown of the Client that escalates the issue to a potential tort.
Client retrieves the tangible item from tortfeasor, and immediately goes to attorney's office and delivers the item to the attorney as evidence.
Attorney agrees to secure / store evidence, and later files lawsuit.
Later, attorney claims Client did not deliver the tangible item that had caused their emotional distress. Assume there are other evidence to prove Client's case.
What is the consequence of the attorney losing the tangible item? Would this item be critical evidence since it was the cause of the Client's emotional distress / mental breakdown?