I'll share some tips on how you can obtain that, halfhalt. 

Currently, the option to view the date of the statement that was printed and mailed is unavailable in QuickBooks Desktop (QBDT). As a workaround, we can check your Print history or Event Viewer on your computer to determine the date.

If you're unable to view it on your computer, it's possible that it has been disabled or restricted by your system administrator. In this case, you may need to contact your IT department.

Keep your post coming if you need more help with customer statements. Have a great day!