There are areas that can be accessed with the help of the resupply box. They need "player clip"

1) placing the resupply box on the wheel of the red vehicle, you can jump the wall and reach the area where the bomb is planted.
2) Placing the box next to the exploded vehicle, you can get on the vehicle and access the previous wall and the fence area.
3) Going up in the green garbage containers, then go up to the small wall and place the box there, it allows you to access the roof of the small house and walk towards the wall that I already mentioned.

1) Placing the box to the right you can go up the hill and cross to the other side without opening the gate.
2) you can avoid entering the house with the soda machine by jumping from the roof to the other side of the wall with or without the help of the box (it is not serious)

The player can get on top of the escape vehicle. But it will die when it accelerates.

Some props that can be climbed (such as the shelf with boxes at the beginning) but I didn't think it was important to mention since they are not shortcuts and the player will sooner or later have to get off them and move on.

You can display the player clips using sv_cheats 1 and
r_drawclipbrushes 2 for testing.