Ducks:
- On top of the shelf to the right of Quick Revive
- On the red container outside the window next to Jugg
- On top of the electric box to the left of Double Tap
- On the railing on the Silo outside
- On top of the railing above Stamin-Up

This will make all the zombies wear a Duck Floatee and make duck noises when killed

Seals:
- On the chair to the left of Jugg
- Inside a cardboard box to the right of Quick Revive
- Across the door that leads to Pack-A-Punch, In front of the 2 black barrels

This will give you a free perk