Hints are coded in rot13
hint 1: Syvc sybjre tbng arrqf lbh gb trg rabhtu obkrf va gur zvqqyr fb lbh pna gryrcbeg ba gbc bs gurz jvgu ubzr gb raq hc ba gur jnyyf.
Hint 2:
Va gur raq lbh jvyy unir sbhe obkrf naq gjb cncref va gur zvqqyr fdhner.
3 bs gur obkrf jvyy ohvyq n gbjre ba gbc bs ubzr, juvpu jvyy ernpu gb gur gbc jnyy naq gur cncref ner arrqrq gb trg guerr bs gur obkrf gb fgnpx.
Hint 3 tells you about which box is the key to solving this puzzle:
Lbh fubhyq nvz sbe gur gbc yrsg fgne svefg naq or fzneg jvgu ubj lbh hfr sybjre gb trg n obk sebz gur obggbz yrsg bs gur fperra jurer lbh trg gur syvc cbjre vagb gur zvqqyr.