All Boosters are new, originally sealed, and unopened
Is this theory a hidden feature of the game, and should you be looking for them every time you open a pack

Aberrant Aeromunculus Agent Frank Horrigan Alpha Deathclaw Aquastrand Spider Armaggon, Future Shark Baxter, Fly in the Ointment Beast, Erudite Aerialist Bebop & Rocksteady Bebop, Skull & Crossbones Bebop, Warthog Warrior Benthic Biomancer Big Bertha Bioessence Hydra Biomancer's Familiar Black Tom Cassidy Bloatfly Swarm Casey & Raph, Hotheads Cloudfin Raptor Colossus, Steel Stalwart Crash, Reckless Endrider Crustacean Commando Cytoplast Manipulator Cytoplast Root-Kin Cytospawn Shambler Dark Leo & Shredder Darwin, Adaptive Mutant Definitely Not a Turtle Dimension X Pizzasaur Don & Leo, Problem Solvers Don & Raph, Hard Science Donatello, Gadget Master Donatello, Mutant Mechanic Donatello, Rad Scientist Donatello, Turtle Techie Donatello, Way with Machines Donatello, the Brains Donnie & April, Adorkable Duo Doorman Drelnoch Elusive Krasis Elvish Aberration Elvish Soultiller Evolution Witness Experiment Kraj Featherbrained Filcher Feral Ghoul Fire-Field Ogre Flamewave Invoker Flatman Foe-liage Franklin Richards, Ascendant Genghis Frog Glintwing Invoker Glowing One Goblin Dynamo Goblin Goliath Goblin Goon Goblin Mutant Goblin Psychopath Groundchuck & Dirtbag Hancock, Ghoulish Mayor Hand That Feeds Harold and Bob, First Numens Hauntwoods Shrieker Helium Squirter Heroes in a Half Shell High-Flying Ace Homicidal Brute Ice Cream Kitty Iceman and Firestar Incurable Ogre

If you remove the last time counter from a suspended card this way, you will cast that card
These Energy cards in particular are quite valuable because of the silhouettes in their backgrounds
The app has helped me with 85% of the grading with 10s