I am no RF expert, but I would guess that it wouldn't take much shielding around a fob to keep its signal from being relayed (given the poor range of the fobs i

I am no RF expert, but I would guess that it wouldn't take much shielding around a fob to keep its signal from being relayed (given the poor range of the fobs in general, the transmitter in there can't be very powerful). Seems like potentially an Altoids-style tin would be enough of a Faraday cage?