"Soldra the Just has shown me no ritual for blessing silver in this fashion - but I don't think these creatures emerge from their slumber unless disturbed, so I suggest we write a warning on the door for any future visitors," Aldbane says. Obviously meta-gaming here, but some undead are a...
These beings actually sank back into their coffins. Which are closed.
Anything else in the room Aldbane can see while he is there? If not, we should move on (unless we really want to fight these things and see if there might be treasure in the coffins).