What is S3 Standard Infrequent Access and how is it represented in reporting?

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Issue/Introduction

What is S3 standard infrequent access?
Amazon S3 Standard - Infrequent Access (Standard - IA) is an Amazon S3 storage class for data that is accessed less frequently, but requires rapid access when needed.  Standard - IA offers the high durability, throughput, and low latency of Amazon S3 Standard, with a low per GB storage price and per GB retrieval fee.

There are no retrieval charges in S3 Intelligent-Tiering.  If an object in the infrequent access tier is accessed later, it is automatically moved back to the frequent access tier. No additional tiering charges apply when objects are moved between access tiers within the S3 Intelligent-Tiering storage class.
S3 Intelligent-Tiering standard and bulk data retrieval and restore requests are free of charge for all four access tiers: Frequent, Infrequent, Archive, and Deep Archive access tiers.  Subsequent restore requests called on objects already being restored will be billed as a GET request.

How many days must an object remain in standard infrequent access storage class before transitioning to Glacier storage class?
Objects must be stored at least 30 days in the current storage class before you can transition them to STANDARD_IA.

* Infrequent Access Storage - This refers to the number of objects stored within S3 buckets of the following storage classes - S3 Standard-IA and S3 One Zone-IA. Infrequent Access Storage cost is the amount incurred for accessing the items that are in S3- IA. 

Below are the AWS S3 that constitute to Infrequent access charges: 

1. TimedStorage-SIA-SmObjects = The number of byte-hours that data was stored in STANDARD_IA storage
2. Requests-SIA-Tier1 = The number of PUT, COPY, POST, or LIST requests on STANDARD_IA objects
3. EarlyDelete-SIA = Prorated storage usage for small objects (smaller than 128 KB) that were deleted from STANDARD_IA before the 30-day minimum commitment ended
4. Requests-SIA-Tier2 = The number of GET and all other non-SIA-Tier1 requests on STANDARD_IA objects
5. Inventory-ObjectsListed = The number of objects listed for an object group (objects are grouped by bucket or prefix) with an inventory list
6. TimedStorage-ZIA-ByteHrs = The number of byte-hours that data was stored in ONEZONE_IA storage
7. EarlyDelete-SIA-SmObjects = Prorated storage usage for small objects (smaller than 128 KB) that were deleted from STANDARD_IA before the 30-day minimum commitment ended

This is how these service items are determined

S3- Standard Infrequent Access = operation = StandardIAStorage

S3 - Storage = Operation = StandardStorage

S3 - API = UsageType = Request-Tier

 

'Infrequent Access Storage Overheard' will count overhead related to just Infrequent Access Storage and not Intelligent Tier IA Storage. 

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By looking at the Cost History report and filtering for S3 IA Overhead and S3 Standard IA, the overhead cost spikes along with the standard IA services.