If you set up a Zone Protection Profile and configure it to block spoofed IPs, then when a spoof IP is seen, it will show in the Threat Log.
To see these logs you have to have installed PAN-OS 8.1.2 or higher and configure the following in CLI:
> set system setting additional-threat-log on
For more information, see here: https://live.paloaltonetworks.com/t5/Blogs/PAN-OS-8-1-2-introduces-new-log-options/ba-p/217858
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