Yep, 1060 microcase. Leave room for a silica packet. Also, taking a look, the top foam on the pelican is kinda thin given how thick the whole box is. Ideally it seems like it could and should be thicker. I don't plan on dropping mine but if it was dropped on the top, it seems like it wouldn't provide as much padding. So try and go deep enough that the mics are well centered in the case and maybe consider more foam on the lid (since a gap might be even worse). Since the case is enclosed and air tight, I'd be careful about introducing anything that could de-gas fumes into the case. My main worry there is that something could react with the mylar in the caps over time but I'm not sure how much of a concern that really is.
I don't know how long this foam will last. I hope it is higher quality than the stuff found in really cheap gun cases, etc.