Rear Deck Lid Corner Droop
Yes, it looks like all Squarebirds came that way from the factory. According to what is said here, there was a problem with the stamping of the trunk lid and they realized it soon after they '58 Squarebird came out. So they put out that bulletin showing how to put rubber bumpers like you have in your engine bay area for the hood. That bumpers, properly adjusted, push back against the droop, causing it to fit better and not droop. So I understood.