That is a master key. Valet keys don't open glove box or trunk locks.

Only possible scenario is that the PO requested a Valet Key and the dealer cut a groove in the center therefore rendering it a master key. Or, it had a valet key key head glued on to replace a broken head.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k