how to open modest stash in wild island

if you just need the code, it's 2711. aeroprotection gas mask will be inside

location

what's inside

how to find the code?

1. next to the door you will see an empty tape recorder with space for four tapes. this is a hint

2. next to the building you will see a bus with a strange symbol on it

3. inside you will see numbers written on the seats and tapes lying on only some of them

4. if you mark the seats where the tapes are lying, you will get this picture. this is the code

5. bingo