Glad to be of service!

With regard to the orc raiders and the tomb, from what I gather, they have only just arrived at the tomb at the outset of the scenario, which is some way from the village and rarely visited itself (because the tomb is sealed, and it is thought sacrilegious to attempt entry), so the orcs are hiding by day and make their attempt in earnest one night. There does not appear to be anybody keeping a permanent watch or guard on the tomb, which is possibly a little strange in context. If there were a guard or watch kept, then the band of orcs would presumably have to deal with them before attempting entry, if they wished to avoid alerting the village to their activities.