I also was a backer. As I understand that the warranty is dated from the time you receive it.
I posted the emails I received from Edwin here Bed is not level - #6 by brent113
It sounds like it was machined after casting to a tolerance of 0.15 mm, but mine was over 0.5 mm out as measured by laying it on a table and sliding gauges under the worst corner.
They asked me to return the one I have for investigation.
At least can everyone wait until mine is in the mail before flooding them with replacement requests lmao