XCLIPFRAME, set it to 1
CLIP command, select each frame then select the DELETE option.
Repeat for each frame until they are all gone.
Too long a process? For a mere $4000 you can upgrade to full AutoCAD and someone can write you a lisp to speed up the process.
>>>...That brings up the question of why is there a boundary around a block...<<<
Ask the file creator why they needed to XCLIP each outlet: it's a deliberate not an accidental process.
Thanks, I'm stuck with the long way. We can't ask the creator of the clips about it as his company has been removed from the project, so they aren't being very helpfull.
Sorry Dean I was trying to reply to the OP
I am using 2010LT so I can't test this on 2012LT. On 2012LT when you type XCLIP on the command line does it promt you for Select objects or does it prompt you to Select Object to clip. If you are prompted for Select objects type ALL on the command line hit enter twice then d and enter.
This example doesn't need a $4k upgrade or LISP routine at all. If you just want the boxes to go away during navigation the solution can be accomplished in one quick step (I used AutoCAD LT 2012).
Simply select all of the blocks in the file, type XCLIP at the command line, and turn them OFF, or DELETE them if you wish. You're done. In a more complicated drawing with other objects something like QSelect might be required to isolate the blocks with clip boundaries showing, but once you have them selected it's still just the one step.