Oh, ok. See, to me finding the trap and examining the corpse would be the main point of the trap. Once they’ve done that, it doesn’t really matter to me how they deal with it, or if doing so costs them anything. Whether they disarm it with thieves’ tools, or spring it from a safe distance with mage hand, or drop the whole chest into a portable hole so they can take it to a trapsmith back in town, it doesn’t really matter, the point is that the existence of the trap and the dead goblin indicating its presence got the players to engage with the dungeon environment. If they picked up on the hint in the description, asked follow up questions to help them make an informed plan of action, and then described something their characters did in response to the situation, I’d say the trap did its job perfectly.