The sentimental value of such an item is what struck me about the toothbox. Just seems incredibly odd for a murderer/robber to take it given the other jewelry present. Kinda says to me someone wanted to keep it.
Just googling sterling silver toothbox, there appears to be quite a range of prices and sizes. Now don't you think, with all the variety out there, that a more detailed description would be given?? Especially if the 'crook' wanted to pawn it.