Fort Vaux combination lock in Chapter 6

[therealdanhill]

I am reading the journal entry, I cannot figure out what it is asking me for.

The time of guard duty was 1600. The victory in june was on the 12th or the 9th if the entry was written 3 days later. There are 4 flags in the room.

What am I missing?

[Dante]

There are 5 flags in the room. (I think this is a 'there were five when that entry was made' kinda thing.)
More: https://steamcommunity.com/app/1286990/discussions/0/4522261213596998909/

[Stoibs]

I got caught up on insisting there were only 4 flags also.
Not sure if I legitimately missed one, or the 'gap' where one is supposed to be was an indication that the clue was misleading and I had to think outside the box,

I ended up brute forcing that a little since I was sure of the other numbers.

[DaemonX_HUN]

Edit: ignore the post, I tried the code at the wrong place.

There are five flags, but the fifth one is tricky because it literally consists of a few pixels (it's a standing mini flag on the desk).

That being said, I don't understand this puzzle at all. I tried many combinations until I realized there are not 3 to 4 flags in the room, but there is a fifth, an extremely small one. That's fine.

After that, I tried using 16 (16:00 guard duty time), 5 (5 flags), and 3 (Wednesday is the 3rd day of the week). 1653 didn't work.

Following this, I tried using 4 (16:00 is 4 pm), 5 (5 flags), and 12 (victory post was on June 12th). 4512 didn't work.

After this, I tried using 16 (16:00 guard duty time), 5 (5 flags), and 7 (according to real calendar, Victory post which was written on June 12th was a Monday, so the previous Wednesday when the victory took place should have happened on 7th). But 1657 didn't work.

I also tried combinations of the previous three, including 0453, 0457, etc. None of them worked.

[foxtrot7846]

The combination 4512 works for the locker in the middle and code on albert's dogtag works for the locker on the left