Automator recognizing some labels but not others

Hi all. I'm trying to create an Automator script that will copy files that are labeled with a given color to a specific folder. I figured this would be straightforward, but I tried forever to get it to work, to no avail. I finally realized that I'm having a problem with the "Find Finder Items" action, and, I think, my Spotlight index. Here's the deal: I have a folder of files, which are labeled with various different colors. The "Find Finder Items" action is able to find files labeled with some colors (e.g. Purple), but not others (e.g. Red). Any idea why this might be? I assumed it was a Spotlight indexing issue, so I rebuilt the Spotlight index using a sudo mdutil command, but this didn't resolve the issue.

 

Follow-up

Actually, this doesn't seem to be a Spotlight issue; Spotlight can find the Red-labeled just fine. But for some weird reason Automator's "Find Finder Items" action cannot.