The box shown here is the Spacer Box for various Corgi Toys Gift Sets including the Gift Set #1 Carrimore Car Transporter with 4 Cars.
It is a yellow 'car style' 'end-flap' type box with the dog logo on all 4 long faces. There are 2 sizes - 'LARGE' and 'small'.
Use of the 2 sizes in the original Gift Sets seems to have been on a random basis ! - so it's personal preference - choose whichever you prefer - there isn't a 'right' or 'wrong' size for any given Gift Set.
Two spacer boxes are required to go with Gift Set #1A.
When purchasing, please indicate the size you require by choosing from the two options above.