I think the green tray is from another set entirely, John, although again possibly from the same manufacturer because of the good colour match between the pieces.
I have seen this tray in amber, pink blue and green (always unfrosted), and several times with similar accessories (but never in the same pattern as Mystery Set 31).
Here are photos of some of trays with accessories that would appear to ‘match’ it. The perfume flask and atomiser with the amber set still have part of an embossed foil label with ‘Bohemia’ on it. The finial on the lidded pot with the pink set has a large section broken from it, but it matches the finial on the blue and amber pots/ flasks.