It wasn't just import paperwork - for those of us poor schleps that slavishly waited for our green slips to arrive, for restricteds, you'll be happy to know that the fine folks in Ottawa were also shredding their copies of the registration slips. That's right, the only copy of the registration slip in existence was the one in your pistol case, that's why everyone had to re-register restricteds when the RPAL/registry came in - no one knew you had a pistol, so they had to build a database ASAP. They started out keeping paper records, but after a while there was too much paper, so when they sent out the green slip, the rest got dropped in a shredder.
I believe that the report you're referring to was the Coroner's Inquest report, I haven't read it in a while - it concluded that it didn't matter what kind of gun Gamil Gharbi used, since he had time to continue and ammo left in his pockets when he killed himself. The police never tried to enter the building and basically, he ran out of potential victims before they entered. You see a lot about guns with the grave dancing crowd, and very little indeed about faulty police response.