Search for Files & Folders

Hello-
I tried doing a search for JPEG pictures on my system using *.jpeg and it only returns 3 files. I then pointed the search specfically to a folder where I knew there were additional JPEG files and it said there were no results to display. I compared the properties of the ones it found to a couple it did not find and I do not see any differences. It seems to be finding other files such as *.doc (though now I have suspicison it is not finding all of them). Any ideas anyone?????