Laguna keycard- which bits identify it?

Having a dodgy keycard that has to be squeezed just so in order to work, I wonder if anyone knows which components actually identify the card? I could then transfer these to a second-hand card and Bob might be my uncle.

Suspects are the transmitter coil (although I suspect is IS just a coil) and the two chips- one black and oblong, the othe bronze and square.

TIA.