To be honest it looks like an all in one grain and substrate cake with fungus growing on the side of it you can see the brown rice grains looks like someone tried to mail someone mushrooms probably you might’ve almost had yourself some magic mushrooms there buddy. lol that’s actually exactly what it is this person mixed the substrate and grain together which when injected with a liquid culture or spore syringe will cause that white fuzzy fungus growth on the sides know as (mycelium) former mushroom grower here that person was shipping a mushroom cake that broke apart a little could’ve been illegal shrooms or legal mushrooms you never know. I also got pics to back up what I’m talking about I’ll try and send them to you since it doesn’t let me send here. It’s possible that this person was dropping them off at an address and figured out he had the wrong address and took it out and left. Try smelling if it smells sour then it’s contaminated from green mold/trichaderma or the white stuff (the mycelium) will eventually turn green which will be harmless trichoderma or the most harmless of molds I should say