The mystery of the Treasure of St. Januarius Mystery Cache
The mystery of the Treasure of St. Januarius
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Difficulty:
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Terrain:
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Size: 
(micro)
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Has the Treasure of St. Januarius been stolen?
St. Januarius is the patron saint of Naples;
Treasure of St. Januarius is composed of magnificent works and donations collected in seven centuries of Popes, Kings, Emperors, famous and ordinary people. According to experts, the Treasure of St. Januarius would be even richer than the crown of England's Queen Elizabeth II and the Czars of Russia. The Treasure is a unique collection of art masterpieces, kept untouched thanks to the Deputation of the Chapel of San Gennaro.
According to some confidential information, the security is suspecting the Treasure has been stolen:
please go there and check if it is still in place!
Early morning or late evening there are less muggles; in any case extreme stealth is required!
You need to search it without being seen, maybe you need to wait for a while!
The cache is not at posted coordinates, but it is placed less than 400m far from there;
in order to find the correct coordinates, you need to retrieve the year of St. Januarius's birth (=B) and death (=D):
they are available on the web!
Add to last 3 digit of posted N coordinates the year of St. Januarius's death and then subtract the year of his birth:
N=40° 51.XXX
XXX=101+D-B
Add to last 3 digit of posted E coordinates the year of St. Januarius's birth:
E=014° 15.YYY
YYY=288+B
Note: if your solution is correct, you will get a spoiler .
Bring your own pencil and beware to the muggles!
Further info:
English Wikipedia...interesting, but not enough 
!
Italian Wikipedia
Latina Wikipedia
St. Januarius Museum
Naples Cathedral
Additional Hints
(Decrypt)
zvpeb zntargvp uvqqra oruvaq na veba cvcr: ybbx ng fcbvyre cvpgher lbh tbg jura fbyirq gur chmmyr naq frnepu ng fubhyqre urvtug.