I've been on E46 & E53 forums for over 10yrs, haven't EVER heard of an alternate way into them. Good idea is to put the valet key in a mag case and attach to chassis, little late for that now.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!