I roomed with my closest friend for our sophomore and junior years. She was a genuinely pleasant, happy person and wouldn't harm a fly. However, for the entirety of our sophomore year, she accidentally DESTROYED everything I owned. Figurines--smashed. Necklaces--snapped and the beads all over the place. Clothing--stained, ripped, etc. She was horrified that this kept happening and I, of course, was furious. Although we agreed to be roommates the following year, our friendship was compromised, and we almost never hung out together. Then she moved off campus for senior year and we stopped being even marginal friends.
Eventually (after I started my spiritual work in earnest) I realized that she was the vessel for a lesson I had to learn--that material things don't matter. But I never would have learned it if the teaching method hadn't been so severe. (As it was, I never figured it out till decades later. But that was just me being thick.)
Perhaps you're getting a reminder of something like that? You're a very spiritual person, Icymist, but have you been clinging to "things" lately? Are you carrying any fear about losing your "stuff"? Perhaps it's time to recommit to the spiritual instead of the material? Something to think about anyway.
Also, it's very interesting that not only was your locker cleared out, but the "empty" tag was put on it. Sure, it was most likely an oversight--the person tasked with clearing out a locker got the number wrong and cleaned out your stuff instead--but..."empty". Is that a message for you to empty yourself of ego and, again, recommit to the spiritual? Be empty?
Snake bangle--that's the earth goddess, perhaps the Minoan Snake Goddess or Wadjet of Lower Egypt. Snakes also represent wisdom and the bridging of two worlds (I know you know this--just thinking "out loud" ). A potent dream. Have you read Patti Smith's autobiography (Just Kids)? I was only a marginal fan before, but afterward I had SO much respect for her. Truly an amazing woman--fantastic writer and artist and musician, and so wise. You were likely among other wise women if you were at one of her concerts.