No they don't have to be, but they can be.
At least my 6 will most likely not be the same. I hope that is ok....
Can the 3 that the cachers get to "do with as they please" be non-trackable or trackable on another site?
To just be clear I activate the 1st 3 that are all sent to 1 cacher to be set free but not any of the other 3. RIGHT??