I would start looking for signs that the engine has been worked on internally. like parts that are cleaned up, excessive gasket material around things like the oil pan and such, rounding of any bolt heads, new parts, anything that could tell you that someone has been inside that engine. If those parts did not come from your truck I can't see why they would have been inside. I hope I am wrong with that tho.
Monitor your oil use very close. Check ALL gaskets, seals and hoses. Dont wait until the last minute when dealing with your warranty and know all the fine print.
There has been a lot of research on oil consumption and that seem about the max in the normal range.