I don't have time to hang in the game for many hours in a day in order to find how it all works and so my question is the following:

If I save my crates for the moment when e.g. mystics would drop again, do I have a chance to get these upon opening?

Or, is the content defined at the moment of obtaining the crate, only hidden until opened?

It seems to me that level of the content depends on which of my characters opens it (which level, that is), but is it the same true also for newly introduced drops?

Sorry, perhaps there has been a thread on this already.

Thanks