Print the report, audit each location on the report, and if anything's in that location, challenge it out. I've assigned each ETL (plus STL), TL, and Brand TMs an aisle to audit, which they submit to me each week (though when possible, try to do them daily as a follow-up), I keep a copy in my binder and leave a copy in a plastic holder attached to each aisle in the Backroom so that when we have DTL and/or other visits, they can just pick an aisle to see if it's being worked. Both the Flow TL and BR TL are overall responsible for getting these done.
AP used to do the whole backroom, took us about 2 weeks to go through it all. Then O/N picked it up. They do a (or supposed to do) a few aisles every night, so they go through the aisles every month. We (AP) still do random checks in electronics, fragrances, sometimes health and beauty. But we now just have to stay on top of the overnight team to make sure they don't "forget" about doing it.