It looks like they've replaced them again, since that time.
And couldn't they have told the scientist that it's "Worcestershire Sauce" and not "Worcester Sauce"? Worcestershire is the county, Worcester is the largest city in that county.
At least it's pronounced correctly. Worcester/Worcestershire rhyme with Leicester/Leicestershire, and pronunciation of "Leicester" should be familiar to Americans as the personal name "Lester". ("Wuster" hasn't caught on yet.)
-cester as a suffix to a place name is from the Latin castrum, meaning fort – these were Roman settlements.