Seemed like Peter was getting his feet wet to becoming an observer!
He looked good with a briefcase!
It was just a joke. But you know what they say about jokes
Well, now that September has gone rogue (I somehow don't think the other observers are going to take kindly to his sneaking his way back to the in to the blueverse) maybe he'll teach Peter some tricks of the trade! After all, we know that it's possible for a very gifted human (such as the man from Making Angels) to understand the science behind the observers' powers...
EstherF, I think September left behind a couple pieces of technology that the Fringe division should have fun with. Walter may glean something from it for future use. I wonder when, or if we'll see September soon. He has an entire universe to get lost in.
"He that leaveth nothing to chance will do few things ill, but he will do very few things." Lord Halifax
Peter has already shown himself able to use Observer technology, in the episode August. I think it's very possible he's the original observer
I bet they have special spectural functions etc, so we can get some wacky fringe science out of them.
But maybe peter is meant to use them for events, like an observer....for important time related things.
"The ultimate paradox of thought: to want to discover something that thought itself cannot think"