Private Property Makes No Difference Whatsoever. Tennessee Will Throw Him Under The Jail! Tn And Ky Have Some Of The Strictest Laws On This And The State Can Come After You The Breeder. Add Crossing State Lines For Illegal Pruposes With Controlled Animal...eh It Get's Ugly Quick. For Intents And Purposes It Would Be More Humane To The Birds To Simply Wring Their Necks 1 At A Time As You Take Them Out Of The Transport Box... Better That Than The Fate They Would Face In The Wild. Raising Bobs For Release/ Restocking Is A Specialty In It's Own Right And Very Involved... Even When Done Correctly By Folks With Proper Training Usually 2% Or Less Survive Long Enough To Breed.
You See Your Friend Doesnt Have A "quail" Problem, He Has A Habitat Problem.... Otherwise He Would Have Wild Birds There Already.
Tread Lightly Here And Think Long And Hard... Research All States Involved Thouroughly And If You Still Wish To Do This And Its Legal, Then Proceed Slowly And Learn The Proper Way To Do It