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 Reference:
Create Custom Reports on Opportunities
Understanding Opportunity Fields

Using a Roll-up Summary field from the Opportunity to the Account is the best way to meet the requirement of showing the total values of open opportunities on account records when enabling Advanced Currency Management. A Roll-up Summary field is a field that calculates values from related records, such as count, sum, min, max, etc. Advanced Currency Management is a feature that allows users to enable dated exchange rates and track historical exchange rates in Salesforce. By using a Roll-up Summary field from the Opportunity to the Account, Cloud Kicks can display the sum of the open opportunity amounts on each account record, and use the dated exchange rates to convert the currency amounts based on the close date of the opportunities.

Account Teams are groups of users who work together on an account and its related records, such as opportunities, contracts, and cases. Account Teams allow users to share different levels of access to accounts and associated records based on their team roles and responsibilities. For example, a sales rep may have full access to an account and its opportunities, while a customer service agent may have read-only access to the account and full access to its cases.