Brendand,
I ran my demo database version of Sales Tax Collected and made sure the Options had 'include' checked. Here is my pic:


Next to check this, I looked into this by checking both the G/L Account my Tax is posted too (Sales Tax Payable) and the Tax Entries table

and can see the Tax Entries, you can search for Tax Entries Archive to see the table.

If the Users have posted transactions that included Sales Tax, the Posted Sales Invoice will reflect this in the Find Entries:

Hope this all helps.
Steve