Looks like we need a dealer employee to answer.

In the UK, CoP means Conformity of Production, and is a certificate from the Dept of Transport relating to where the vehicle's parts were produced. Sounds like it could fit.

In engineering, COP is code of practice, but I like the first definition.

Let's see what a dealer says.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue