Office 364 Reporting Web Service Message Trace - It says it can get the past 30 days but i can only get the past 7 days

It says Message Trace data is stored for 90 days here: http://technet.microsoft.com/library/jj723162(v=exchg.150).aspx

When running the MessageTrace report using the Office 365 Reporting Web Service it only returns the past 7 days, even though it says up to 30 days here: http://msdn.microsoft.com/en-us/library/office/jj984335(v=office.15).aspx.

PowerShell’s "Get-MessageTrace" cmdlet only returns the past 7 days as well. PowerShell also has an alternative cmdlet called "Start-HistoricalSearch" which returns the MessageTrace results between 7 and 90 days old.

Is it supposed to return 30 days, or is the documentation wrong, or is their an alternative report (like PowerShell) to get MessageTrace results for over 7 days using the Office 365 Reporting Web Service?

Note: I'm aware that the results are returned in batches of 2000 MessageTrace results.