I guess since they weren't caught there's nothing to report about it so we probably wouldn't know... so I assume yes. Also Whonix works in perfect combination with QubesOS, so at that level of opsec is fucking hella hard to caught someone, IMO.
This. When the safety tool/system is so good that you don't realise if it is working or not. I think a better question would be "whether anyone was compromised while* using it?"