CAN Shield Extended ID's

Hello, has anyone read a CAN ID that is in the extended 29 bit ID format? I see the ability to write with an extended ID, but I am not seeing an option to read an extended ID. Is this done “automatically”? It doesn’t appear so, as I am trying to access my Honda Accord which from what I read uses extended ID’s. However, I am just reading 4 HEX characters now. Looking at the library .cpp file I see all sorts of references to a a variable ext, but not sure how to pass it in the getcanID() function. Any help or advise would be greatly appreciated. Thank you.