I just finished a job where the previous homeowner blew in cellulose insulation that was waist high in places. No kidding! It was in snow drifts in the corners and the outside wall had a bank that was shoulder high! Luckily there was minimal electric in the home (i.e. no recepts or lights in half the house).
In a place like that you are more likely to find a rat than a j-box.
A demographic rule of thumb that I picked up at the home improvement magazines I consult with: Over half of single family dwellings have been built since 1970.
Of the half built before 1970, a big proportion will be dwellings that will attract attic J-boxes. I see a lot of 'em. The core legacy circuit or two from a time of 30 Amp service entrances.
In 2 story homes I wire, I routinely run a 1" EMT to the attic and terminate in a 12x12x6 pull box for the 2nd floor circuits. When I do this I mount the pull box in a central part of the attic where there is the most headroom and mount it on 24" 2x4 risors/plywood. This not only makes it easy to find in the future, it also keeps anyone from having to lay in cellulose to access it.
Since I have to put my name on the document, I crawl into every attic, crawl space for each inspection I perform that requires it. I will admit, I am the 'dirtiest' inspector I know The contractors usually ask me 'what?' when I ask for a ladder for the scuttle hole Like I said my name is on that final document and it won't go on that document until I am satisfied the work complies with the MINIMUM code requirements. The biggest problem I find in attics is 320.23
Hi, Thanks for all the replies. I can remember a time ot two or three where I have seen boxes without covers, cables without connectors terminations without wire nuts and my favorite...a splice with a wrap or two of 33.
I also like where the new AC unit is tapped from the range wire or HW heater..
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The contractors usually ask me 'what?' when I ask for a ladder for the scuttle hole 
