When I worked at a (non-BMW) dealer, dealer parts inventory only showed up in the national system if dealers made it available to other dealers. If they wanted to not share it, it didn't show up in national searches. Sounds like it may be a similar situation with BMW parts.

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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