My reaction to this is, "What does it matter?"
Guitar strings are a cyclic process; ya know, you put them on, you play them, they wear out, and you replace them. They are constantly changing, whether you play them or not.
They're not that expensive and replacing strings periodically is understood from the start- it's just routine maintenance.
I see no point in obsessing over something like this; you can't measure or prove any of it anyway. If your 4 month old unplayed strings sound and feel okay, go ahead and play them. When they wear out replace them...