You can use CloudTrail API/CLI to view past 90 days of account activity.
Syntax:
lookup-events
[--lookup-attributes <value>]
[--start-time <value>]
[--end-time <value>]
[--cli-input-json <value>]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
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