WOW!!! What a beautiful snake. I got myself a Boa a few months ago & I just love him. When I got mine, he was a year old & a little under 4ft. Might be an indication on the age of your Boa. How do you try him with food? Mines a very shy eater & has to be fed in his viv & left alone. Could be a minute, could be hours before he decides when he's ready to eat. I've even left his prey all night & went to him the next morning, food still there, had a coffee, went to remove the rat & it was making a bulge inhis belly. Funny eaters sometimes. Keep up the good work with him.
Just one thing, Those markings look to good to be true, I think you should ship him to me.