I've been unable to find any helpful info.

The only animal/caffeine studies I've found were either about it being pretty deadly to insects and mollusks, or just it being a toxin to animals in general. That didn't rule it out to me, since pretty much anything that gives you a buzz is because it is disrupting your vital functions in some way.

There is probably much more coffee on farms these days as opposed to wild coffee, so if coffee farmers aren't reporting the coffee being eaten directly, or noticeably high predation of what does eat the coffee, I'm going to say it sounds like it's not a thing. It would probably be hard to select which animals actually ate enough coffee to get an indirect caffeine jolt from, and it could work the other way as well, if they consumed something that ate more beans than the predator could handle, making them sick.

With the dolphins chomping on the blowfish, it's not like the fish is sometimes poison and sometimes not, so it's simpler to figure out what to do.

There was a test on zebrafish and rodents testing their reactions to unwanted stimuli, and it seemed to boost their reactions, but not in all cases, so effects seem to vary by species and individual. So maybe it is just a happy surprise if they eat something weird.