Unable to complete mixtape collectibles, as the latest update changed the area where the car was where a mixtape was.
Check the surrounding area, including within houses, as when region revamps happen the collectibles also get moved. Tho im fairly certain no intended revamps happened in Dark Skies.
There is nowhere, I could say that I also checked under the stones. The sad thing is that I only need collectibles to reach platinum. Anyway thanks anyway.