Did you check more than one mapping program to be sure it was more than 10 miles? Would they measure from zip code to zip code or zip code to actual location? I have found different sources offer different mileage so it make me wonder if that is an issue.
Out of curiosity I just used Google maps to get mileage from my zip code to an adjacent zip code with interesting results. Zip code to zip code the shortest route (also the slowest) was 7.2 with the fastest at 7.6. My zip to a specific location was 9 for the slowest and 10.5 for the fastest. At only 2 miles over, they could easily have come up with something at 10 miles or under. The only way to know is to contact them for clarification.
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