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That is the virtual MAC address for the BSSID the device is connected to. If you want to find with AP that BSSID is broadcasted from, simple replace the last digit of the virtual MAC with 0 and you will search the AP for its base RF MAC.
The virtual MACs for the 2.4GHz start from the same base RF MAC, in your example, the first 2.4GHz BSSID will use the base RF MAC :96:00, while the next one will increment one the last digit (:96:01) and so on.The 5GHz BSSIDs start from the last hex...