I just rec'd 2 books that the bubble wrapper had been torn open and rubber banded back up.  There is a big red check mark on it but nothing else.  Do you think they were inspected?

well i had one book inspected and the post office enclosed a note telling me it was inspected and rewrapped

i do not remember if they used a check mark

Yes, proper inspection would include an insert and maybe an official stamp on the outside.  You package sounds more like it was damaged enroute and cobbled back to gether.  Those are sometimes done very well, and sometimes very sketch (like yours).

I have gotten notices on two different packages. They were inside with the book and I swear they did such a good job of repackaging that I had no idea that it had been opened/resealed. The torn-up packages that I get have no note (unless they deliver them in the "apology bag") and are all probably just damaged. 

I was informed by my postmaster yesterday I should start bringing my media mail in still opened so she can inspect it and mark it that way since it seems that USPS is planning on inspecting most media mail now due to catching a few packages that carried other things than media. Doing it this way will help my packages stay sealed on the trip at least.

And if you choose to do it this way Edward, by all means go ahead.  

BUT remember you are doing them a courtesy.  Although Media Mail is always subject to inspection, there is no regulation that requires (or even allows) inspections at the counter with the customer present.   There is a specific DMM guideline for inspections and it is not the one requested by your PO.

Media mail packages that have been opened for inspection always contain a note stating that the reason the package was opened.

Also you should not have to bring media packages in unopened.  If it takes me an hour or more to wrap the MM packages I am mailing, image having a line forming behind me at the post office while the clerk looks at each book prior to me wrapping it.  They cannot demand that the packages be unopened for  premailing inspections.  Some clerks will try to tell you they can but it is not correct.