What do you mean by gurantee? You mean a little card that they usually kept inside the pocket...
I heard that sometime they took it out, because they have to attach it to the store receipt. However, you can ask for one.
Here I believe it would be two years for LV bags... Due to domestic consumer laws. At least I believe it would be like that, allthough it hasen't really been "tested".I think you mean warranty, like you can bring your bag in for say 1 year and they take care of manufacturing defects etc.? Here it's 1 year...