The ad system doesn't publish a readable sellers.json, so nobody can verify these lines. That's the ad system's gap, not the app's, so no points are deducted.
Evidence (12)
line 1 mopub.com, 2e898693f0174c3db477c400e11c3f4a, DIRECT, 74b46c0ea83967ca
→ sellers_json: returns a web page, not a sellers.json file
line 3 facebook.com, 766081393512545, DIRECT, c3e20eee3f780d680
→ sellers_json: returns a web page, not a sellers.json file
line 5 adcolony.com, 5d8cbf6671c93a42, RESELLER, 1ad675c9de6b5176
→ sellers_json: returns a web page, not a sellers.json file
line 7 openx.com, 540785403, RESELLER, 6a698e2ec38604c6
→ sellers_json: HTTP 403 to automated requests
line 9 pubnative.net, 1007170, RESELLER, d641df8625486a7b
→ sellers_json: HTTP 403 to automated requests
line 10 Verve.com, 15290, RESELLER, 0c8f5958fc2d6270
→ sellers_json: HTTP 403 to automated requests
line 13 loopme.com, 11303, RESELLER, 6c8d5f95897a5a3b
→ sellers_json: HTTP 403 to automated requests
line 21 gamaigroup.com, 423056, RESELLER
→ sellers_json: file is not valid JSON
line 23 loopme.com, 11424, RESELLER, 6c8d5f95897a5a3b
→ sellers_json: HTTP 403 to automated requests
line 25 openx.com, 559798512, RESELLER, 6a698e2ec38604c6
→ sellers_json: HTTP 403 to automated requests
line 29 pubnative.net, 1007501, RESELLER, d641df8625486a7b
→ sellers_json: HTTP 403 to automated requests
line 36 smartadserver.com, 3817, RESELLER
→ sellers_json: HTTP 404