Part numbers as follows:
5-21-8-213-931 $38.56 Plastic wallet key. Emergency use. (it will break, no regular use or carry intendeed) (however, it will not open the glove box either)
51-21-8-213-932 $43.23 Valet key, metal but no remote. Intended for carry/valet use. (left key in MD's pic)
66-12-6-955-750 $163.71 Master Key. Remote and daily use.

Had to replace them a while ago.

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2001 e53 4.4i Sport, Nieman Marcus Edition. Stealth One.
2013 e70 3.5d Stacked, Custom