Cost explorer not indicating service

The situation you're describing with Cost Explorer seems unusual and may indicate some configuration issues or data anomalies. Let me address your concerns:

1. BoxUsage without region prefix: Typically, BoxUsage charges in Cost Explorer are associated with EC2 instances and should include a region prefix. The absence of a region prefix is uncommon and might be due to a data reporting issue.

2. Savings Plan discrepancy: The fact that the sum of BoxUsage items without a region doesn't match the Savings Plan amount is concerning. Savings Plans should be applied to eligible usage, and this discrepancy suggests there might be an issue with how the Savings Plan is being applied or reported.

3. "Dollar" line item: A single line item titled "Dollar" with a large charge over $24,000 without any service indication is not standard in Cost Explorer. This is highly unusual and requires further investigation.

Given these irregularities, I would strongly recommend taking the following steps:

1. Double-check your Cost Explorer filters and groupings to ensure you're not inadvertently excluding or grouping data in a way that's obscuring the details.

2. Use different dimensions in Cost Explorer, such as "Usage Type" or "Operation," to see if you can get more granular information about these charges.

3. Compare the Cost Explorer data with your detailed billing reports or AWS Cost and Usage Reports (CUR) for more comprehensive information.

4. If the issues persist, it would be advisable to contact AWS Support. They can help investigate these unusual line items, the missing region prefixes, and the large "Dollar" charge that lacks service details. This level of ambiguity in cost reporting is not typical and should be addressed to ensure you have accurate visibility into your AWS spending.

Remember, Cost Explorer should provide clear, detailed breakdowns of your AWS usage and costs. If it's not doing so, there may be an underlying issue that needs to be resolved with AWS's assistance.
Sources
Knowing the differences between Billing and Cost Explorer data - AWS Billing
I don't have any server running on EC2 but it's charged for $1 every month. | AWS re:Post