Even if it was "dropped" from an aircraft, what would explain the heat of the object? People on the ground said it was too hot to handle for :30 minutes after it was on the ground.
There's not enough friction from an intra-atmosphere fall to generate that kind of heat. It certainly makes be believe that it came from above the exosphere.
Assuming it came from space (conclusion based on heat), it likely wouldn’t have been anything launched. Who launches iron? Aluminum, steel, titanium sure, but iron? That would seem to be too dense to be worth launching.
Meteorites are cold as they land, though. The heated part burns off on the way down. The inner part is just barely warming from single digit Kelvin temps. This is a surprising thing but true. I suppose if a rock had been in a close orbit to the sun it might have warmed up all the way through.