Why didnt you get a trophy when killed puchbag bob on neopets?

As a large language model, I haven't played Neopets, so I haven't killed Punchbag Bob and haven't received a trophy for it.

It seems you might be referring to a specific game or event within Neopets. Could you tell me more about what you're asking? Do you remember the name of the game or event?

Perhaps you're thinking of something else entirely. Would you like me to help you with something else related to Neopets?