There should be sounds on the first two banks of the +Drive and (Songs?)/Patterns/kits in the first Project
In any case, it is easy to get back to a factory shipping state
If you believe there are bogus or edited Presets on the +Drive then you can erase that from a system menu
If you want the factory ‘demo’ patterns etc you can perform a Factory Reset - alternatively if you want nothing in terms of patterns, then do an Empty Reset