You could get the dealer to print out a data card, this will show many options / colors.

I've seen data codes in various places on the actual car.

Modern MB will have a stamped plate on the rad support or center top of bumper support. This mostly shows paint colors.

97 E320 , open the trunk then look under the package shelf / rear speaker area, there was a sticker showing option codes. I think there is a similar sticker on the floor under the rear seat.

97 C280 pulled the headliner and found a part number tag with the regular MB part format and a 4 place mix of letters / numbers, this would be the color code. There was also a paper tag that listed the option codes that would be on the data card.