CZ's have a pretty durable finish so don't worry about having to have it coated with lube/preservative, unless you're storing it for a long time.
I have numerous handguns that have been stored in their original foam cased boxes since the 80's (both stainless and blued) and there have been no issues with their finish.
Being that the SP01 has a surface more durable than a simply blued firearm it will not be effected.
You can purchase a silicone impregnated cloth and simply wipe down the outside of the gun every time you take it out.
The plastic bag can possibly have a negative effect (if stored for a long time without proper lubrication). I have seen guns stored in plastic bags with visible finger print rust marks. These are guns that were handled and not wiped down, then stored in plastic bags. Through time (not sure how long), the moisture left behind rusted.
I happen to also have the SP01 and love it! The Kadet kit fit mine after a couple light passes with a file.