I was about to put up a post but I'll just take advantage of yours - anybody who has a journal that was used to communicate across time previously will be able to do so again now. I've got extraa here at the DOA ready to hand out to anyone who wasn't around for that.
I just ask that we try not to distract them from their mission too much. I don't think the journals will draw attention to them but magic usage is always going to be a risk with Interitus.