As Richard R states, you may sell anything shot as a hobbyist, as long as your
intent at the time of shooting was noncommercial. You can even actively market your hobbyist collection of footage, after the fact, as long as that was not your intent when it was shot. So, you only need the 107 if your intent at the time of shooting was commercial. If you already have your 107, it's a moot point. Without your 107, you shot everything as a hobbyist, so you can still now sell anything you want from that collection, as you had no commercial intent when it was shot. The only fly in the ointment with this wonderful business plan, with everyone getting a drone now (CostCo is selling Mavic Pro's for $989 in all the stores with a 90 return
and free crash insurance---"Just bring us back the broken parts!" ---CostCo Warehouse manager quote from today!), your "unique", irreplaceable, one-of-a-kind drone footage from the past can now be replicated today by anyone else with a drone! Laws of supply and demand say it isn't worth much with an infinite supply available!