Don't think the digital odo is more tamper proof than the old fashioned mechanical jobbies.
They are not. There is whole industry known as "clockers" than reset digital odos.
Verify the mileage through service records, emissions test, car fax, etc. Use all of them.
Some investigator in our area did some research on a group of used cars on dealer lots, and found 1 in 3 with tampered odos...
1998 C230 "Black Betty"