 SIP of e-mail has been correctly preserved, including original unique 
identifiers such as Message-IDs. 
However, it may still have no way of showing whether this really represents all of 
Yoyodyne’s email. For example, if there is a three-day period with no messages in the 
repository, is this because Yoyodyne was shut down for those three days, or because the e-
mail was lost before the SIP was constructed? This case could be resolved by the repository’s 
amending its description of the collection, but o