The DOJ is desperately beside themselves in an all out effort to avoid the transparency and oversight of a special master?

You can almost "smell their desperation here". 

The main question is why are they so afraid of transparency if they did nothing wrong and were justified in their 30 armed agent raid of Mar-a-Lago? 

The late night filing opposing was almost childish. Claiming that after sending 30 people to raid the place, showing pictures of the raid to the public (not a single legal analyst has a good reason for this), but then telling the Court that a special master would be a security risk?  

Moreover, as Turley and others have pointed out, the 1978 Presidential records act allows a former President both access to their records and the opportunity to declare privilege over these papers (in fact they are literally considered privileged for five years). However the court filing suggests that no such legal ability exists and suggests (falsely) that Trump having access to any of this was potential obstruction when the law literally demands that right. Seems as though the DOJ would like to pretend that the PRA does not exist or is not relevant here. 

This is similar to how the warrant suggested that there was no "secured locations" in Mar-a-Lago (as far as they knew). Yet, internet researchers took about 10 minutes to find the public White House records which stated that two areas of Mar-a-Lago (the office and the storage area in question) were both declared and considered secured. The office was declared a secured briefing room and the storage locker was declared a secured storage area. Unless these were "revoked" by Biden, they remained secure locations at the time of the raid.