I like a little mystery too.
Its not really an issue anyways, as Xavier will be keeping the sword and shield he has been using up til now. They were given to him by his father when Xavier joined the paladins of Heironeous and they were blessed (in a non-magical way) by the clerics of Heironeous when Xavier set forth on this mission. Xavier is not going to toss them for some bling given to him by an evil goblin priestess.
The fact that there is some form of masked enchantment on the weapons only confirmes Xavier's intention to not use them. When all this is over, Xavier intends to make an offering of the items to the temple. The clerics can do with them as they wish. For now, they will be packed away somewhere, in a secure box if there is one available.