Oxygen is suppose to be an enemy of roasted beans so I dont leave mine out.
They go into one-way valved bags and sit in a cupboard that doesnt get used often so they stay *in the dark.
I wouldnt think theyd pick up any plastic smells and if they did, would one day make any difference?
I squeeze out all the air I can before and after sealing the bag.
I mostly buy mine from a well known professional roaster and I have been there and watched my beans roast.
They went into the airtight bag as soon as they were cool.
I do know though that generally the batch goes into an airtight plastic container until bagged.
Im not sure what happens in the next day or two after roasting as far as venting the CO2.
So theres a little room to move their on how youd like to do it.
Obviously the less airspace in the container the better.