Question about lockers

[DuDeMaN]

I haven't seen an answer to this question I have had about lockers for a while now, and if this has already been asked, could someone please post a link? Anyway, I was wondering how exactly lockers will work. Lets say I find a Jackhammer on the ground that I want to keep, so I run to the nearest base/tower/building with a locker, and stuff it in there. Will I be able to grab my Jackhammer from any locker, or only the locker that I put it in? If it is the second answer, is there anything that keeps other people from opening that locker and taking the gun that I worked so hard to find?

Thanks for taking the time to read and answer this!