Do I need a high perception or something? My repair is at 70, so I can jam them. But looking both in the guide, and the wiki, I can't find the walls.

Are you talking about where the robots come out of? You cant enter those, also has anyone found that plasma rifle out the back? You need atleast 75 locksmith to get it.

Yes, I do mean the ones the Security bots come out of..

I've read in multiple places that you can JAM/BLOCK the walls closed (so they can't come out)...

However, even though I KNOW where the doors are (or supposed to be) I can't find them to JAM them.

(and yes, I've gotten the unique gun a few times now with different chars

I had this happen to me as well. On my very first character I noticed the text pop up when I was exploring, and then went through systematically jamming all of them. And now I don't have any characters that can "notice" the wall to jam it. Curiouser and curiouser. Broken by a patch maybe? <_<