I tried to run the following web query to get all the uploaded dates for Bangladesh 2004 data after 2004 Jan, but all I got was Jan 2007 as a result.

http://unstats.un.org/unsd/comtradedist/refs/getDataAvailability.aspx?lowT=2004-01-01&r=50&y=2004

 Is there a way to determine when it was first published?