Determining if a new Blu-Ray includes an unadvertised Ultraviolet code slip?

[mstrsmth]

I buy a lot of Blu-Rays, and while most discs advertise the inclusion of an Ultraviolet code slip, older titles sometimes have codes inside that isn't mentioned on the artwork or with a Ultraviolet sticker on the shrinkwrap.

Two examples are Crank and Shoot 'Em Up, both of which I picked up at a discount store a few days ago. Additionally, I find that some new blu-rays have new UPC stickers placed over the existing one, sometimes on the cellophane and sometimes on the case itself. Do these stickers indicate anything?

Also, I sometimes pick up new Blu-Rays that have loose, heat-style shrinkwrap (rather than cellophane), and I'm wondering if this is some kind of indicator as to whether old stock had been opened to place a code inside, and then resealed?

TL;DR is there a master list of which blu-rays include a code? Are there any other identifiers on the packaging that tell you if a slip is inside?