Not sure if the terrier box and ferret collars are going to work the same but you may also need....
ferrets,
purse nets (unless only using dogs or guns),
spade,
probe?,
carrying box for ferrets,
knife,
small torch?
small folding saw?
food and water for ferrets.
couple of small long nets?
Cage etc for ferrets to live.
permission? possibly..
You dont need all the above, but it all comes in use at times!!