>look for something you missed

A bit too vague for your liking, but maybe you can try and expand on this thought. What exactly could have been missed? There was nothing that you could tell was missing in the first room, since opening the door was clearly the only puzzle to solve. There is at least a good 50% chance that you solved the last room's puzzle, because otherwise this room would have to have been open the whole time. None of the hallway doors besides these two work, assuming that nothing has changed due to you making absolutely no progress in this stupid room.

Even if you were to go back and mess around with the last puzzle, it might just end up locking you out of here, and you really do not feel like dragging the chest out of here as an obvious precaution. It might be a lot lighter without the brick and cinderblock, but it is by no means enjoyable to move around. And there is not much else that could be done with the chest anyways.