Sometimes, no matter what you have tried, it simply doesn't work. I tried everything - having my attorney wrote letters, emails, fax..I still didn't see my ETA original come in. I filed 140 with a request of duplicate LC and had receipt dated Dec 1st 2006. After seeing a few people here file 485, i decided to do so. The only risk, per my attorney is if my 485 is rejected because of nonavilability of original ETA750, i will refile when 140 is approved and i will have to pay one more time.
I want to give some update on my case.
Mine LC was certifed last year Sep 14 on line. However, i haven't received it since then. I filed 140 with duplicate requst of LC on Dec. 6th. During the interium, i filed 485 but was rejected because of lack of the proved priority date (mine is 2-13-2004). On May 8th,2007, it showed online that my 140 was approved. It took exactly 6 months to get duplicate request approved. I am still waiting for the originals and pray this time original 140 will not be lost by USCIS. I am totally losing my confidence on the US bureaucrats.
Hope my case can show some light for people in simialr boat.