There are several excellent websites that detail the locations of the eggs. The Winter Egg is not one of the missing ones.
londo954-thank you for the location of those eggs. This means that those four eggs as well as the Fifteenth Anniversary Egg were in the Maple Room. I think I read there were at least two or three other eggs found here. These eggs were probably from the years of 1905 and onwards. Any help with this would be greatly appreciated.
The Rosebud and Coronation Eggs were in the Imperial Apartment in the Winter Palace.
I am also curious as to which of the Dowager Empress's eggs were removed from the Anichkov Palace in 1917 for the Kremlin. It seems like if all her eggs were kept here, they were not all removed.
Thanks!