Thanks for the offers of help, but...

He needs them now, right where he is or at least very close. It turns out that there seems to be no shop in Norway that has (yes, the ordinary Lisco/Fidelity) 4x5" holders in stock, and the situation seems to be no better in Gothenburg.

I would loan him mine, but there's no way of getting them to him today or early tomorrow except catching a late flight to Oslo, meeting him there, and then flying home again. And that might just be a tad too expensive...