The real Savarez strings have a little tag in the package that has a number on it, and some instructions printed in French. If that tag is missing, the strings are definitely fake.
I just opened a pack of Savarez Alliance MT yesterday, and the tag was there. Also, the strings were each in their own little paper envelope. They don’t need to be individually bagged in plastic as the strings come in a plastic package with a tear tab, that keeps the outside air out.
Buy them from a reputable dealer, and there should be no worries.