I'd sure start by getting a refund or replacement from the vendor, at least for anything with rot ... OTOH, the beds on these trucks were painted, maybe your expectations re grain & color aren't realistic, grain matching is a fine woodworking thing - Mar-K occasionally has 'free freight' sales, if you can wait, they're the only place I'd recommend - alternatively there are vendors in CA where you may be able to actually go and see what they have before you buy, and maybe you could inquire where their wood kits come from, likely some source it from Mar-K
Bill