A report that highlights opportunities with a closed date earlier than the created date would directly address the issue of opportunities being created after they are already closed. This report helps sales management gain visibility into how frequently this occurs and enables them to identify patterns or specific reps who may need additional training or oversight.

While the Opportunity Pipeline report provides an overview of upcoming opportunities by stage, it does not specifically address discrepancies between created dates and closed dates. Automation to update the opportunity stage could help manage data integrity but does not provide the necessary visibility into how often opportunities are created late.

Salesforce Documentation References:

Create Custom Reports on Opportunities

Understanding Opportunity Fields