I think the metal polish u get from the quest is a metalpolish40 and not a metalpolish60, you get a polish feel with the 40, but it doesnt quite mirror off like the 60 does. Both can be tested in cash shop.
You can always just keep doing missions, and hope they drop that yellow will drop for u. Alternatively you can look for a colour set (the ones with fixed 6colours), and see if there is one where there is a yellow colour for your backpack =P
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