i don't recall having to do anything special to make them show up. You should at the very least see some of the default reports that come with the vcloud management pack. I would verify your vcd version, vrops appliance, vropsta appliance, and management pack are all on a supported version with one another.
I think the ta appliance will only read vcloud director specific reports. As a test can you clone an existing report and change the name so the beginning starts with [vcloud director]