Because that's a fake recipe that was written just to rack up page views, that wouldn't actually work at all if you tried it. Making crab cakes isn't going to work at all unless you sweat the mushrooms to get the water out -- you cook them for 20+ min on low with a lot of sea salt, and then you rinse off the salt and squeeze out as much water as you can before forming them into crab cakes and pan frying.
If you look at the different photos in that recipe, you can see that the one on the tree has several times more water than the one purchased from the store. So which '16 oz' is it even referring to?
I'm just going from memory. The last time I found them I harvested an entire tree worth, and that was enough to feed two people for two nights. I think I filled up a Baggu and a half worth, and each of those holds at least 15 lbs of mushrooms.
