OS X Yosemite: If you can’t find a file
If you can’t remember where you saved a file, or if you don’t see it where you expected, try any of the following to find it.
Search for it. Click the Spotlight icon 
in the menu bar, enter the file’s name in the Spotlight search field, then double-click the file in the search results.
For more information about Spotlight, see Search with Spotlight.
Click the Finder icon in the Dock, click All My Files in the Finder sidebar, then choose View > Arrange By > Last Opened.
Choose Apple menu > Recent Items, then choose the file from the list (if it appears there).
In some apps, you can choose File > Open Recent (or something similar) to see a list of recently viewed files. Some apps may show a list of recent files at the bottom of the File menu instead.