There could be several ways to look at this.
If it was a perp, then it was a perp very familiar with the house.
What would that perp gain?
If it was RM, what would he gain?
If RM had help, what would they gain?
Those items were an impetus in getting noticed, as those items had to be found in the garage.
There were reasons behind it. If the perp is someone that RM knows, then having the phone, money and wallet being discovered is key.
If it was RM then he wanted IM to find these items.
If it was someone he knew that helped him, then it was part of the fabrication to get those items noticed.
What is the motivational factor for these ? Why?
So it could be any or all of these really.
Maybe RM wanted to get away. Maybe he had help. Maybe someone was after him. Who knows.
I have several opinions and I don't always think it is just one way all the time, so I express several scenarios of what could have happened.
IMOO.