OK - I see. The ones with the underscore that are not valid wav files are the Mac's hidden resource files. You can ignore that, or put a test in the code that ignores all files with a leading underscore.
If you look at the other wave files, you'll see a bunch of dots, like this:
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. . . . . . . . . . . . . . . . . . .
That means that the file
is playing. The periods are printed, um … periodically, while the file
is playing. If you're not hearing anything, then you probably have a problem with your hardware.
How do you have the shield set up? Are you using a speaker or headphones? If you post clear, detailed pictures of both sides of the shield, we'll check the assembly.