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Bucket loads of water pisses through the two holes at each end when you open the boot and naturally then soaks the carpet. No accident seal is not perished.Look around the seal on the lid. If there is any moisture that may be a clue.
Has it been repaired (accident) or has it got perished seals?
How much water? A drop or an ocean?
I think your right seal looks a little squashed. as for rust it didnt have any but now due to the leak I think I'm due a new boot lidget a new rubber seal around the boot cuz they can get squashed over time and water flows over the top. thats why mine was leaking and when i say leaking it was alot of water haha also see if you have any rust around or on the bootlid cuz thats also a way that it gets in