I think you’ll have more success retrieving your things if you just stay on top of the facility manager. You might even offer a small ‘finders fee’ (don’t leave money with the facility – offer to pay when you get the items back). I can’t imagine why the auction winner would want to keep personal items like paperwork and photos, but I can see why they’d feel uncomfortable at the thought of meeting you. I’d make it clear that you would just like your personal effects back and don’t want/need to interact with the auction winner.
Industry Tip: You can order lockers to match your school colors by having them painted in colorful two tones with the frame one color and the doors another. Another option is to match your combo locks with the color of your lockers; you can even have your school logo imprinted on your locks! The sky’s the limit with us so be creative in showing your school’s spirit and pride!