If the primer crimp is intact they are not reloads. (But there's a very small chance they could be remanufactured from surplus brass)
The M2 ball dated prior to '53 or so is probably corrosive. Group that stuff together to shoot at the same time. After shooting, clean your gun as normal. Then clean the barrel and gas cylinder again with hot soapy water. Then clean a third time as normal leaving an oil residue for corrosion protection.
If the ammo came from the CMP it's not reloaded.
Proud member of the NRA and Texas State Rifle Association. Registered and active voter.