If the camera is in mint condition, it most likely was well cared for. BUT... do expect to do the basic routine CLA on it anyway. The seals are probably ready to be changed anyway n a going over will only di it good. So if the price reasonable n in your budget, it may be one of those lurker great deals I only dream of.
Got a boxed NOS Mamiya RB67 Pro S body kit a 3 years back that I assume was an unused back-up that sat for 20+ years. DIY seal job on the RB adapter and back was all it needed. All for $120 and I'm still smilin'.