I don't see the rust issue. That's going to be cleaner than 90% of any other 6 year old 200 series in Colorado. Short of finding something out of Southern CA, AZ, TX, etc, that's clean. Yes, that one seam has surface rust but as I look around the rest of the undercarriage, it's pretty clean (front control arm seams, transmission cross-member, rear differential). If you want something cleaner then I'd bet you just eliminated 95% of what else is out there for a similar year when looking nationwide. That said, it's not clean enough I'd pay a premium for it, but if it's a good price for you, then it's no dealbeaker in my book.