If the Tenant challenges it and you have to go to court, you will be hard pressed to find a judge that will side with you as the landlrd trying to make the tenant pay for a 5 year old fridge because he broke the plastic bins and glass shelves out if it.Additionally, IF the judge DOES side with the Tenant, you could be looking at paying the tenant back x double in damages (at least in AZ they can collect up to 2 month's rent or twice the cost of security deposit withheld).So I am just saying that it's a risk. 

Think about it, you are going to get moisture penetration so do you want to block it from escaping with a piece of plastic and then put a nice paper backed sponge in between to hold that water around your wood framing?

They sell a big box of the plastic ones for not too much at the box stores.

You said "blue boxes" so it's plastic junction boxes and they are typically installed say 1/2" proud of the stud face, the rotozip would need to hit the OUTSIDE of the blue box and go all the way around. 

And DO NOT let them put in an above ground pool either (unless it's one of the $20 plastic ones from Walmart). 

I've also just learned about inserting a new plastic pipe inside the main and epoxy lining all the pipes.

Yes, he had LIVE exposed wires twisted together with no plastic cap hanging in his shower for years.   

After this was done we put down 14mm plastic under the house as a moisture barrier.We dug a French drain around the front of the house back to the creek to help with any moisture issues under the house.While we were under the house we also replaced all the plumbing with brand new pipes.Both bathrooms have been completely renovated with the master getting a full custom tile shower and the other bathroom getting a soaker tub with custom tile surround.

Paper or plastic?

I don't know if it's a law or not, but when I rented an apartment in VA a few years ago they had changed the toilet seats and left the plastic on so we would know they were new.I researched the cost, and at ~$12 a piece decided to do it when my rentals turned over in NC.