That's a bummer and odd.
a) A 6K car should have no need to change shoes and it would have been cool to see the original markings if it was a 6 k car.
b) Odd because who the hell changes brakes for the heck of it. Check 'em, adjust 'em, and leave 'em unless something is bad or worn.
perhaps someone rode the brakes or a wheel cylinder went bad etc. I had a caliber hang on my jeep right after i bought it, ate through the left front pads over half way in just 60 miles.