A more recent picture of them:
There are actually already visible gills running down the stems (oyster mushroom gills being decurrent). It's really cool.
The mycelium growing on the cardboard in the pie tin is spreading nicely (although, again, it's unclear whether it's oyster or mold), so in a week or so I'm going to transfer it to a larger substrate. I'm thinking mostly shredded paper and some spent coffee grounds.
If it seems worth doing, I'll also take some tissue from the mushroom-farm mushrooms and try to clone it, too. Looks like I'll need to come up with more empty pie tins somehow. Darn - no rest for the wicked!