Damaging invisible traps (Shaco boxes, Teemo shrooms) with AoE

If you're playing as somebody like Morgana and you see an enemy Shaco place a box or an enemy Teemo place a mushroom somewhere, I feel you should be able to damage it by casting Tormented Soil at the far off spot where their trap went invisible. I could be wrong, but I'm under the impression that these traps are invulnerable until they are revealed and I don't think that's fair. If I'm wrong and aoe spells like Tormented Soil already damage invisible traps, please disregard my post.

I think it's lame that pretty much the only counterplay to these traps is using a pink ward or upgraded sweeper trinket.