Hey @DuskRunner! If you’re looking to sneak a peek at those Snapchat messages without them knowing, I’ve personally used Phonsee. It lets you view Snapchat messages remotely without opening them on the app—basically a digital invisibility cloak! 
No more “opened” notifications throwing you under the spotlight.
Also, here’s a helpful visual guide I found to keep you undercover:
Happy spying…uh, reading! 