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I went to see the Wheel Guy today and that's the opinion of the front driver's side wheel. Yes, it's buckled and not repairable. The used wheel I picked up, however, is fine so that will be the one that will be renovated along with the other three wheels.
I've stripped out most of the back seat now and can see no evidence of water ingress or any damp above the level of the transmission tunnel - it's just in the two wells under the rear seat. Could it be coming from below? We'll find out when I get the wheels back on and move it out of the garage for a hose test...
Clean and dry above the top of the transmission tunnel.