I am not going to lie i am having issues on if information on atari 2600

I know that the model CX-2600 was produced threw1977 to 1979 and there was a few different types made. The only version i lnow are the 4 switch and both the heavy and light sixer. Where i have been running into my issues is knowing what kind of conditions my 2600 atari is in without any of the factory package but runs incredible well for its age. The major problem other than not knowing the condition is having the pricing range for the year 2020.My goal is to find out if i paid market price or got rob blind.Any help or information you can give will be more than appreciated.