Congrats Sajha Keto,
Below are some threads and info regarding letters from labor ministry...
They are little old, but I think they are still relevant.

http://sebsonline.org/forum/forum_view.aspx?F=16&T=80748


http://sajha.com/sajha/html/index.cfm?threadid=55631

http://sajha.com/sajha/html/index.cfm?threadid=61766