ChemexBonded Filter - Half Moon - 100 ct - 2 Pack - Exclusive Packaging

If there's a pack of 2, does that mean there are actually 200 Filters in all?

will they fit 6 cup chemex coffee maker?

Can I use left over filters from Chemex 10-cup in a Funnex?

How can you be sure these are authentic chemex filters? I've read that some people have received imposter filters through Amazon.