I think you are right, and the solution is a meta-textual reassurance, specifically of the form:
"if one of the statements is true, then which casket should the suitor choose?"
One can re-phrase every logic puzzle ever as "Assuming that `P` is true, what can you deduce about `Q`?"; or one may assume that a logic puzzle of the form "`P` is true. What can you deduce about `Q`?" is really shorthand for the former. I don't begrudge mjd for pointing out this shorthand, but I do think that his description of the 'solution' (to the meta-problem, not the actual puzzle he poses) is facile at best, and creates bigger problems at worst.