Choice the best model when all scores are identical

Sir,
I have received an output for the job S72970 (http://zhanglab.ccmb.med.umich.edu/I-TASSER/output/S72970/). All five models score identically. The protein structure is not resolved, and I do not have informations about ligands, so I do not know how to perform an alanine scan.
There is a known domain in the structure, but the peptide align partially to more than one model. A literature search was unsuccessfull, in particular it seems not known the position of the protein in the sperm flagella (it is the sperm autoantigen protein 17). nor other useful indications.
What is the best procedure we could suggest to operate the best choice, in this case?
I am grateful to you, for the results and for your attention.
Best regards.
Anna Giulia Cattaneo