Temple artifacts = PERMANENTLY found in the Temple. Thus why the evil alters (Ahaz, Ash Pole) aren't allowed, even though some cards may seem to imply otherwise. Thus the note at the end of the glossary entry:
NOTE: Several items may be periodically found in the temple, but are not considered part of this category (e.g., Asherah Pole (Ki), Priestly Breastplate (CL), Priestly Breastplate (CU) or Priestly Breastplate (Pi), Priestly Crown (E), Urim and Thummim (Pi))
