Dealer put wrong mileage in during service. Any issue with this?

I bought an extra fob from them since my car only came with one. But the mileage they put on my invoice was 4,000 less than what I have. Usually not an issue, but now on the Carfax it’ll look like I only drove 2,000 miles in 6 months instead of the 6-7k I usually do. Should I have them fix it, or just leave it alone. They said the tech probably just hit the wrong number on the keyboard typing out the invoice.