I think you’d have to check just to make sure they are the actual retails dvd covers, but…
The silver set can be found here…
ANH - http://www.freecovers.net/view/0/8e3e904f1af4cd5d84af838866093054/front.html
ESB - http://www.freecovers.net/view/0/423f407e20228178f9161d5bf3e7b06d/front.html
ROTJ - http://www.freecovers.net/view/0/fc384abb77d8d273cbca8c24de455736/front.html
The gold set can be found here…
ANH - http://www.freecovers.net/view/0/4b825841e87b5b3685b237c809c4bfc6/front.html
ESB - http://www.freecovers.net/view/0/1224d247cd982a8c5b5af286d3c45b98/front.html
ROTJ - http://www.freecovers.net/view/0/64b0d25654f39ae3b7cc47b8f89fe811/front.html
Freecovers.net does have a decent search function - so if they aren’t the exact covers you’re looking you may be able to find them still…
You have to register there to be able to download the covers - though they are usually ‘decent to very high quality’ covers and have their own forums too.
Good luck with it 😃
In the ‘star wars dvd covers’ thread on here - http://originaltrilogy.com/topic/Star-Wars-DVD-Covers/id/741/page/178 - there are lots of alternative/edited/altered covers to those 2006 versions (and a lot more besides).