First you need the map that is hidden in the Secret Stash at the tree house.
After that go back to your room and decipher the route on the Treassure Map with the help of the new map you just found.
Once you solved the puzzle you can see the the route shown by the given numbers.
Now step to the Junk Pile which is in front of the house and enter it.
Inside the Junk Pile
Follow the route shown by the numbers on the Treassure Map.
1. Go left
2. Go right
3. Go left
4. Go left
End of the Junk Pile
At the end of the route you will find this box with memories of Chris’ mother.
Locker Code & Cellphone PIN
The locker combination is located in Dad’s trophy showcase. The code is 2005, the year his dad won the championship.
The cellphone PIN is the combination of keys used to write HAWTDAWG on the keypad of old cellphones. 42983294