What's the code to the fence?

[TepeS]

Please tell me, what's the code to the fence? Where is the hole that the man in radio talk about?

[stAtic15]

Go to the radioroom and listen to the beeps, with one of your notes opened (the one with the morse-code info) and write down the numbers.

Or if you don't want to, click spoiler...

Spoiler below!

5738

I think this is the right code, someone correct me if I'm wrong