That's a real shame and I hope that you can have it repaired.
Coach has made white bags in the past that are listed just as "white" not ecru or bone, etc. Some of them are spectator bags that are white with a colored trim but there are other bags are pure white.
I know that some of the bags from the 1990s came in white, like the spectators and the lightweights bags and I'm sure that the Beckett Zip also came in white. Scroll through some of the 1990s coach catalogs in the Reference section and you will find some white bags.
Coach often uses the term "ivory" and I think of that as pure white - but I don't know if it meets your desire for snow white? Some of the Italian Madison Bags from later in the 1990s came in Ivory. Here is a picture of my ivory Madison Spence bag 4400.
View attachment 5412326
View attachment 5412329