The only other way is to look at the RPO code listing located in the right cubby hole in the trunk section, look for UQA. If the vehicle has nav, it will come with bose since it was a required upgrade for nav. You can easily check if the vehicle has navigation by either noticing a nav button on the center stack, or if you only have access to the VIN, it will have a C,D,G, or H in the 5th position. Aside from those two methods, I can't think of anything else to check since I haven't noticed anything in the radio menus that could be checked to determine if it's a bose or non-bose system.
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