Welcome to my second series, I had a blast coming up with this one. To complete this cache you will have had to have completed all of the Cluedo clue caches (18 in total), you could try and guess the end coordinates but that would take you some time!
The cache itself is an ammo tin.
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If you have visited all the feeder caches you should have 18 clues in your possession (5 persons, 5 weapons, 8 locations), you now need to cross all the clues you have learned off the grid below leaving you just 1 person, 1 weapon and 1 location.

Under each remaining item is a 3 character code, this should now be converted to a 3 digit number.
e.g. The example shown previously on the feeder caches had K = 7, H = 3 , B = 0 - therefore a code of HBK would give you a number of 307
Using that information - You will find the cache at these coordinates:
S 31° 4M.YYY E 115° 4N.ZZZ
Where:
M & N = from clue cards
YYY = ( Person - Weapon )
ZZZ = ( Weapon + Location )
WHODUNNIT?
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**Congratulations to Chwiliwr on not only FTF for this finale but the whole series.**