Well i found this a while ago on a level 1, i was going to GM island on the zepp so i got off and went into fatigue and died, so i was in the crossroads and just walking around and talking and stuff you know what people usually do in the crosroads, so then i went up to the top of this tower and found this wep crate with a gray lettered wep in it. I sold it and got like 3 or 4 siver and it spawns like every 10-15 minutes so heres a screenie of it on another toon
and this is the tower