My sister's getting an iPhone 4S for xmas, and wanted me to get her some cases. I got her a few regular cases off of Amazon, but she also wanted some novelty cases in fun shapes, like the Gameboy one.

I grabbed like five random cases on Ebay for under $2 each, and they all smell atrocious. I'm worried they're highly toxic/carcinogenic, and if exposure could negatively impact health--should I toss them out or give them to her anyway? Is there any way to get rid of that funky smell, or should it disappear on its own if I leave it outside/bathe it in baking soda? Should I coat them in some sort of spray sealant? Thanks!