How to get In-Place archive mailbox in Exchange Online using Office 365 APIs

I want to get list of folders/emails inside In-Place mailboxes. But both mailbox list and folder list doesn't returns In-Place mailboxes.

This is what I have tried till now:

1. Get mailboxes using following request

Request:

https://outlook.office365.com/api/v1.0/users('someuser@somedomain.onmicrosoft.com')

Response:

{"@odata.context": "https://outlook.office365.com/api/v2.0/$metadata#Users/$entity","@odata.id": "https://outlook.office365.com/api/v2.0/Users('12637010-f344-4827-9e3b-21218392985d@649b37da-e479-45dc-a099-fda797d7fcee')","Id": "12637010-f344-4827-9e3b-21218392985d@649b37da-e479-45dc-a099-fda797d7fcee","EmailAddress": "someuser@somedomain.onmicrosoft.com","DisplayName": "User Name","Alias": "user1","MailboxGuid": "12312312-a498-46d1-93a8-870cd3faffec"
}

2. Get folders listing

Request:

https://outlook.office365.com/api/v1.0/users('someuser@somedomain.onmicrosoft.com')/folders?$top=100

Response:

{"@odata.context": "https://outlook.office365.com/api/v1.0/$metadata#Users('someuser%40somedomain.onmicrosoft.com')/Folders","value": [{"@odata.id": "https://outlook.office365.com/api/v1.0/Users('someuser@somedomain.onmicrosoft.com')/Folders('ABCDA3AYxNjE2NjQyLWE0OTgtNDZkMy05M2E4LTg3MGNkM2ZhZmZlYwAuAAAAAACbFtMO1RLxQoChh4quwNSoAQChU257vJJfSLjbblRIqUFSAABgaA9RAAA=')","Id": 'ABCDA3AYxNjE2NjQyLWE0OTgtNDZkMy05M2E4LTg3MGNkM2ZhZmZlYwAuAAAAAACbFtMO1RLxQoChh4quwNSoAQChU257vJJfSLjbblRIqUFSAABgaA9RAAA=',"DisplayName": "Clutter","ParentFolderId": "ABCDAAVCNjE2NjQyLWE0OTgtNDZkMy05M2E4LTg3MGNkM2ZhZmZlYwAuAAAAAACbFtMO1RLxQoChh4quwNSoAQChU257vJJfSLjbblRIqUFSAAAAAAEIAAA=","ChildFolderCount": 0,"UnreadItemCount": 0,"TotalItemCount": 1
    },
    {
.... other folders like Inbox, Conversations, Conversations history etc.
    }]
}

Is it possible to get it use Office 365 unified APIs? If not, is there any alternative? If yes, how does In-Place mailboxes are treated by Exchange online; folder-level(doesn't looks like) or at user level mailboxes?

Note: I have changed sensitive information in requests and responses