The only thing I dont understand is why HP would replace anything without goirish's permission. Normally, the tech should inspect the engine and then report the findings to the owner prior to any parts being replaced without consent. (except for the missing keepers, which is what he sent it in for)
An engine that ran fine, then was oiled and put away sealed for some time shouldnt have needed anything but the keepers replaced and installed. Somethings obviously goofed but I couldnt say what without getting my paws on it.
Luckily, its sounds like someone with some engine repair experience will be checking it out soon.
Best of luck goirish.