The twisted pieces of orange-coloured sheet metal on the tank holding the FDR are most of what was stripped from the top of the CVR enclosure displayed a few posts up the thread. Attachment points for where the CSMU was positioned on the CVR enclosure are visible.
The seemingly intact ULB cylinders on top of the tank - one of which was suspended in brackets protruding from the side of the missing CSMU - look incongruous beside those twisted pieces of sheet metal and the mangled sheet metal CVR housing the pieces were torn from.
With so much of the CVR in hand, it is tantalizing to think that the CSMU was nearby, but somehow overlooked.
As lomapaseo intimates, the CSMU might be embedded with other debris. While a thorough search through the artifacts already brought to shore has probably been done once, a second pass with fresh eyes couldn't hurt.