It's happened several times. Artifacts and items from Mirrorbound worlds have come through in a seemingly random assortment, running the gamut from essential to utterly useless, though in general, they seemed connected to particular Mirrorbound.

[He sets his coffee down again, sitting back against the softest part of the armchair and looking up thoughtfully at the ceiling.]

I'm not much for sentimental possessions, and I suppose it was never properly mine, but it would have been something, if the notebook had made it here. I'd have liked to study it more.

[He shrugs.]

It still could, perhaps.