Yeah CA-2A is not included. To find your other included plugins do the following;
For pro channel plugs, open the pro channel and at the top of it click on the + icon. You will see all PC plugs listed and a flyout for the style dials.
For included VST instruments and effects, head to the plugins browser, click audio FX then right click on the plugins tab above and select "sort by manufacturerer". Then click on the Cakewalk folder. Do the same for instruments.
Note the above will only show you the Cakewalk plugs that are included. There are others included too that will be listed under their manufacturer.