That explains why I didn't see anything: when you attached the file it didn't have any of the references with it so I didn't see the elements. The 3 'elements' you saw that you couldn't figure out what they were were most likely the references themselves. When you attach a reference, and have the Level set to Default in the Attachment Settings, the entire reference comes in on the Default level and appears as a single element in the Default level of the master file.
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