Hi Jedi! How ya been?
3 months is a long time for you not to have seen your snake shed. Maybe he shed in multiple pieces and you missed it if the cage or viv were really dry? Also possible that your snake shed in his hide or maybe it got caught in something else you use to decorate the cage with? What do you use for substrate? Also, not all snakes look "blue," especially if you've got a red-eyed snake. I have two different types of snows, but both have red eyes and unless I'm looking for it, I can actually miss their pre-shed or "blue" state. My big guy (Bozo) actually shed WHILE he was swallowing a small rat! I thought he was just rubbing his mouth on the bottom of the tub after a meal like they sometimes do, and all of a sudden I noticed a flap of skin turn upwards from his lip and slowly he just wiggled out of it like a long, shiny, magic banana coming out of a peel! It was both cool and eerie simultaneously, like an acid trip or a flash-back resulting from one! (Oh! Sorry! Wrong forum! LoL!!)
But seriously, maybe more info is needed. Like what kind of snake do you have? What's your setup like? What color's his eyes? Etc.
I'm certain with the right info, someone here will help you figure it out!
Later!