A customer sent me a STEP file so I can use camworks to make a machining program.  He told me 2 different people checked the file and it contains one body.  When I open it in Solidworks 2016 it contains 2 bodies.  When I open it in an old  copy of Solidworks 2007 on a different computer it only contains one body.  

The computer with Solidworks 2016 has a copy of this extra body that the customer sent to me as a STEP file about 1 1/2 months ago.  I have the STEP file and the imported part file in a different subdirectory.  Is it possible that I am picking up the body as a reference somehow.   Is there somewhere to look in the STEP file itself to check?  I am at a loss.