My husband and I were in China during the nesting season in 2016, but when we came home in the Autumn we surveyed the boxes to see what had been happening.
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The SSPP boxes showed plenty of evidence of use, and some current residents!  There have been reports of chick sounds from some boxes which is very encouraging.  Next spring, a more careful watch will be kept to try to identify the species in residence.
Box 1 (including mouse!)
Residents of Box 9
Box 10 - well filled, but upside down!
Box 16 contents
Box 17 contents