Any reports that are delivered in Unifier in any version later than the 9.9.3 base code stream would be found in the Reports node in the left hand navigation pane, either the User-Defined or Custom sub-node.
If it is the System Audit report then it would also be found in the Reports node in the left hand navigation pane, both pre/post 9.9.3 base code stream.
If they are the System Reports then they are found under the Company Workspace tab, in Administration Mode, under the System Reports node, both pre/post 9.9.3 base code stream.
To see what any of these reports look like open the report item found in the right hand pane of the Unifier window and click on the Run button.
Note that the user has to have permissions in order to have access to any of these reports.
Unifier does not come populated with any sample data. Until you push data into your schema, any stock reports would not display any information. Remember that Unifier is intended to be a fully-configurable platform, so until you develop and implement the design there is really nothing to output. Even if you get any of the pre-built content, this does not include any sample data.
Compared to a product like Primavera Contract Management--there you have the option of beginning with a "blank" database or one with "sample" data. Unifier is like the instance of a "blank" database always because of the way it's designed and intended to be used.