Martyns vapour £27,400 is now safe, but did he deal too soon, or did he play the game perfectly?

Box 2 contains: £5000!! Not what we wanted to see, we need to find the high reds!!
Box 13 contains: £75,000!! Much better!!
Box 3 contains: £50,000!! Good, although the £100,000 and £250,000 remain.

THE BANKER WOULD HAVE NOW OFFERED, FOR FEAR THE £250,000 WAS IN BOX 7, £36,000

Martyn, what would your next 3 numbers have been?