Using Finding is finding me confused

Using Opus I wish to find all the files with the extension "pdf". The folder I am searching in contains a number of sub-folders, and there are many pdf files.

I open the finder window and in "name matching" type: *.pdf. This produces nothing.

How I construct find:

And the result:

I am obviously missing something. Help would be greatly appreciated.

Are the PDF files in those folders created after 01/02/2010... because that's also one of your parameters (judging from your screenshot)

Your are right! Sorry to trouble this forum with this oversight...