Cheap Ebay iPhone case smells weird-how do I get rid of the odor? Is it dangerous?

I bought a bunch of novelty cases on ebay for a couple bucks each. They all smell atrocious, and I'm worried they're carcinogenic or something. I was going to give them to my sister for xmas, but I don't know how bad these toxins are:/.

Is there any way to remove the scent? I've left it out over baking soda for a day now, and it doesn't seem to have done anything. Should I use some sort of sealant spray over it?

Febreeze?

EDIT: I also don't think it would be dangerous. It's just the material it's made of. Why would people sell something that would hurt somebody? They'd want business back.

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