Box of valuables (8,5)
I believe the answer is:
treasure chest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">box of valuables</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for treasure chest that I've seen before include "Box for valuables" , "source of wealth" , "Box of wealth" , "Box for valuable items" , "Repository of wealth" .)