You could build a RFID zapper from a disposable camera:
OR you could try using this device:
Radio Shack High-Power Video/Audio Tape Eraser 44-233A
it's basically a demagnetizer/degausser that might have some effects on electronics, i'm not entirely sure though, i ordered this off ebay, i'll let you know how it goes.
You could also try ordering some super strong magnets and placing them over the site where you think the chip might be. According to Wikipedia, N54 magnets are the strongest available magnets.
I've tried several strong Neodymium Magnets, with no luck at all.
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