The cap to the fuse box is missing can someone please tell me the what fuse I need and what one it is, thanks

 

I actually cracked open my fuse box today to check the audio and radio fuses. I have the bose system in mine. I put a picture. It should be fuses 22 and 21

 

I have 2003 maxima with Bose radio for some reason the radio is not working but it does work on the steering wheel controls is there anyone out there that could help with this problem , I've check the fuse it's ok . I've recently changed the battery and this is what happened any help would be appreciated .