Key 7
Located in the house opposite the bank. The key is in the bedroom, in a box under the bed.
Key 13
Start at the bridge (Milton entrance) and walk down the river to the next wooden bridge near the farm. Then go down the river (almost to the cliff) and turn left. You will see a corpse and a backpack. Search the corpse.
Note: Crows circling above it will help you find the corpse.
Key 15
Located on the farm. First you have to open the house - the key to the door is in the car by the barn. Then go to the bedroom and look for the vase (on the left on the fireplace).
Attention! You will need this key to complete the storyline, so you cannot pick it up until the Gray Mother asks you to.
Key 20
The key is behind the gas station, on the floor of a blue truck next to the blue booths.
Credit Card
The approximate location of each key on the map.