I have the brand new set of 19" 326M alloys that came with my new E89 in April with the Bridgestone Potenza RF tyres - they were replaced with 19" 313M alloys and Eagle F1 non-RFTs in the first week of ownership. All totally unmarked and with a full tread all over as they were only used for about 100 miles. If you're interested then I'll post some photos and establish what they're likely to be worth from someone like Mr Wilks, who buys and sells lots of BMW wheels.
BMW 326Ms
19/8.00 ET29 Fronts
19/9.00 ET40 Rears