I passed your idea about putting it to use and seeing what happens to Jim, the owner of the piece.
He seems simply to want someone to confirm that it is a beeswax mold, so when Virginia Webb, who is probably one of the most expert wax people working today, said it couldn't possibly be a mold for liquid wax, he said he was continuing on his quest.
I guess the only answer he is looking for is someone who will say, yes, it is a beeswax mold and if a person really wanted to know, as you, Lone, pointed out, the only way to know for sure would be to pour some melted wax into it and see
(1) if it would in fact contain the liquid wax and
(2) if you could get the wax to release from the wooden mold.
I still think it looks like a drawer for containing letters from old fashioned printing presses, or maybe a drawer to contain something else.
Linda