When I shop for my 2nd 850 T-5, after the first one got stolen :( , my mechanic taught me 2 tricks to verify if the mileage had ever been adjusted. If no maintenance records provided.
1. the number will not stay in line if they'd been adjusted, maybe not too noticeable, but can be seen.
2. check the mileage window around the rim, there will be marks, unless someone disassemble the whole cluster just to get to it, too much work.
However, I am in Taiwan, no idea how it works in the States. People seems to care more about the mileage & the $$ then the maintenance. If I were you, I'll try find a more realistic car with a complete maintenance records. At least I will know what I am getting into. Volvo makes car that last, so I don't think any reasonable driving mileage matters.