Just read through this thread and it is a public relations nightmare for Corsair. If they are selling something "sealed for life" it is clearly not fit for purpose if leaks after the first couple of months. I can understand why the have to draw a line on rembursement somewhere, but really they should clearly state the limits they impose on the box. They must do this going forward so at least users know the financial exposure they are at vs. total risk if they build loops themselves.
One point I noticed regarding the warranty I felt was not completely made clear (apologies if I missed it). The EU requires the manufacturer to supply two years warranty, so in the UK the first year warranty is with the reseller and the second year is with the manufacturer. This is how EU & UK law both work together to protect consumers. I know you are in Australia so quoting UK law is only of academic interest but look here at "Claiming compensation for consequential loss":
I think you should be persuing this through your reseller (supplier) now Corair have admitted a manufacturing fault, the reseller can sort it out with Corsair.
GL with it and remember in the grand scheme of things this stuff is not that important even though it is a financial hit if you accept Corsairs offer. You seem to have a good handle on things.