LFOTT is a great book. It's been referrenced on many threads--including Windsor Jewels--to help clarify the fate of much of the jewelry, including dispelling the common rumors which constantly pop up.
As for non-jewelry items, I do wonder what all was taken. Miechen made out pretty well due to Bertie Stoppard (sp?) who smuggled out, at great personal risk to himself to say the least, some very nice pieces which she split up later between her 4 children--rubies, pearls, diamonds and emeralds or sapphires.
Xenia left with some really fabulous pearls which she was defrauded on in France and later sued over.
I don't think Mavra left with very much at all, much like Maria Pavlovna Jr. I think she (MP) referrences some small items in her biographies but certainly nothing much--more sentimental than anything.