Aaron and his sons taking down the veil and covering the ark meant that no one except the high priest and the sons of Aaron ever caught a glimpse of the ark. The same holds true for the rest of the Most Holy things. The veil that separated the Most Holy Place from the Holy Place was unique in that it had the cherubim woven into it. (This was not the case with the veil at the entrance of the tabernacle.) This, then, was the veil that would cover the ark of the covenant.
5 Au départ du camp, Aaron et ses fils viendront démonter le voile, et ils en couvriront l'arche du témoignage;