Crack the Code!

The following patristocrat-style cryptogram has been found among the notes of a group of professional thieves. The plaintext was destroyed, except for the last two words: "museum artifacts." Please try to recover the plaintext, if you can. The ciphertext has the letters grouped into sets of five, for ease of transmission

Good luck!

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Y :
Z :

Frequency of cipher


Frequency of English

A joint project of Prof. Seth Dutter and Prof. Gregory Bard of the University of Wisconsin---Stout, Department of Mathematics, Statistics, and Computer Science. (October 31, 2013)