That always worries me, sending pigeons with no training. Yes, they will have flown enough miles around home, but first time they see a hamper they are put in a transporter (or lorry as you would call it) and spend the night frightened out of their minds.
Of course if there is a big drag in your direction, and they get away from the start well, they will very likely get home.
And will have learned nothing.
Many years ago I was given a pair of eggs, off very good pigeons. One of the youngsters was a big blue chequer cock. He was late bred, the first race was over before he was old enough to train. But he was a big, cheeky bloke, so I took the trouble to go through the 2,4,6 mile stages with him, sent him 15 miles with some other youngsters then put him in a 80 mile young bird race. He arrived with the first ones, but sat in a tree for a while trying to figure out what had happened.
That'll do, I said.
I put him aside and next season he was a very good yearling widowhood cock, then went into the stock shed.
It's only my opinion, and therefore not worth much,

but I do think that they are like race horses. They only know what we teach them. If it's a race horse it needs to know to jump out and follow a running rail.
If it's a racing pigeon it needs to learn to jump out of the box and head for home. I do believe that's our job. Before it's shoved in a hamper and sent to a race.