Foam sounds wrong.
Anyway without a single piece there would be gaps at the four corners, so probably any regular non-foam tape from a stationary shop etc will do. Random stuff I've bought locally for putting thin alloy panels back on equipment was like the original. I've just no idea if it's waterproof, but on reflection that doesn't matter as it's best to assume the H2O isn't waterproof. My idea of a waterproof case is one that has a clamped neoprene ring in a groove, the door flap is halfway on that. I can't see how an original H2O won't leak between panel and bezel anyway.
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