The golden skull should appear immediately, but badges and other rewards only appear after completing any one of the maps. The same can happen with posters; they can only award badges after completing the map specified in the quest once. Regarding trophies, most are tied to Steam account achievements. If you need to get them, use the SAM-Picker program.

So, I couldn't fill one locker because they were event trophies... namely:
1. Snow Globe (New Year 22)
2. Pumpkin (Halloween 22)
3. Easter Eggs (Easter 23)
4. Cauldron (Halloween 23)
and others.

I also didn't receive any Twitch drops.

To install:

Download the archive with your save
Disable cloud sync (if licensed, in Steam or another launcher)
Go to the following path: "C:\Users\"Your Username"\AppData\LocalLow\Kinetic Games\Phasmophobia"
Unzip the archive contents to this folder (replacing them if necessary)
Launch the game
Check your save
Exit the game
Enable cloud sync (if licensed, in the same way you disabled it)
If there is a cloud sync conflict, select the local save (the most recent one)
Done!

Author: Alicelel