API and client have different search results

System

Using the MediaBin Windows client to find the number of folders:

Criteria: Name = exists
Location = Media Database (include subfolders checked)
Include In Search Results = Folders

returns 4889 folders

In a script:

Set objRootContainer = g_objSession.RootContainer
Set objStartContainer = objRootContainer

set objExistConstraint = g_objSession.CreateMetaDataExistsSearchConstraint (strMetaDataId, 1)

set objExistCriteria = Create_Criteria (objExistConstraint, 10000)
set objAllContainers = objStartContainer.FindAllContainers(objExistCriteria)

returns 3339 folders

I thought these would be the same?

Thanks,
Peter Garcia