ATC: airplane 67Z, "traffic westbound at your 2 o'clock, 5000 feet"

Now, if I see the traffic, it's "airplane 67Z has the traffic"

What if I don't have it visually, but it shows up on my traffic
display? I've heard stuff like "yep, got 'im on the fishfinder" but
I'm wondering if there is a standard "official" response?

there's also the thought that if you don't have it visually, you don't
really "have it" - i.e. the electronic display does not provide as
good separation info as actually seeing the traffic with your Mark 1
eyeball.