It is good practice to pull your engines apart after you purchase them. Sometimes there will leftovers from milling and if it was out on display there could have been something dropped in the car. If it is a cheap engine I wouldnt worry to much about it, but if you are spending good money then if it were me I would pull the engine apart. Most manufactures will tell you take it apart, add tread lock to some of the screws such as you BACKPLATE and other various parts.
These forums are supposed to be friendly. From what I have seen the moderators arent doing there jobs.
Just have fun that is what this hobby is all about.