Found 1 note next to the lightbulb and something in one of the ventilation grates.

A secret area? in the corner by the tv

reach the key in the grate?

to reach the key you need the wire and the bolt

to get the key for the telescope you first have to use the key u find on the floor and open up the hatch as soon as the hatch opens alittle click on the opening and youll get the grey key but you have to do this fast

click on the knife with the bolt and it will fall out

The bolt: It's next to the green pipe on the floor, Use it to get the knife
The wire: Use the knife on the wire outside

to get the bolt go to the pipe and click around the bottom then use the bolt on the knife in the ceiling and after that to get the wire look outside and wait a few seconds when the wind blows youll see the wire just click on it and its youres

I have the 1 note, 11 note, found the V note on the roof, and the 2 in the secret area

use the telescope outside on the furthest building for the other number

the v is the number 5 so this is the order of the numbers 5 1 8 2 11 put them in that order from rite to left with the arrow keys

And I guess the combination is: V 1 8 2 11
But I could be wrong

1. there is a note on the shelf
2.another one under the door
3.there is a key at your feet, put the key in that panel your standing in
4. open the panel, and click REALLY quickly in the gap to get a key. (if you dont the grenades will drop and you'll die)
5. that key unlocks the telescope
6. go to the pipe, at the bottom on the right of it there is a bolt (dont turn the wheel, you'll die)
7. click the ceilgin above one of the vents and you'll see a knife. throw the bolt at it
8. go the hole in the window and wait for the gust of wind
9. when you see leaves, and wind, get ready, a green wire will swing from the left. CLICK IT, you dont need to drag the knife

10.use the telescope while youre at the window to get another numbere
11.there is a note on the ceiling, it says V (think roman numerals).
12.look at the vent above the TV, combine the wire with the bolt and ket the key.
13. it is the key to a secret panel by the window on the lower corner wall. use it. this will give you another number
14. go to the safe.
15. use the arrow keys on ur keyboard to move the numbers.
16. the combination is 5 1 8 2 11
18. use the green key in the door.

tada!!!

number 11 is under the door

number 11 is under the door

Number 11 paper is under the door, click on the right hand side