Hi, Looking through the list of AUX_RESORB file on the QC web site you indicate, I can find the following files:
S1B_OPER_AUX_RESORB_OPOD_20160630T194724_V20160630T154741_20160630T190511.EOF
which covers your product. The first date in the file name is the generation date while the second and third dates are start and end validity dates.
Note that the orbit data included with the product is of high accuracy. For even better accuracy you will need to wait for the AUX_POEORB (generated about 3 weeks after the acquisition).