Is it detectable by a GM?

Is the bunny box glitch in anyway detectable other than the GM standing right next to you? There was something like this in Maplestory years ago where you could "lag" a party quest and get the rewards multiple times. Some people were banned for this.

Apparently not, considering SEA GMs banned only the people who were reported on the forums.

Just don't video your exploiting or screenshot it, you should be fine. Some, say they do it constantly and never get banned but some have gotten banned from it and over used it, so it's really if you want to take the chances if you use it a lot. I myself have only done it a couple of times.

It's only detectable if they check into it, via logs.
Just don't get reported, and you'll be fine, unless you're blatantly obvious.

i don't think there's a viable to check on it for now other than the fact that you have a lot of gold suspiciously.

They have logs, which they can check, and see your activity for up to 7 days.
Normally, they aren't "alerted", unless people report you, then they check the logs.