I've changed the search criteria to BlobNamePattern  field it as attached, and still not getting anything.
 

Currently if I use this code works, but not the above API setup!?

set file="/Persistent/Credentials"
        set endpoint="https://s3.amazonaws.com
        tStatus=""

      res.DownloadBlobToFile("MTCbucket","MTC_88667","/archive/MTC_88667_archiced.json")