Seen similar box's of sweets around in various locations, and many differing companies doing a similar thing. I maybe wrong but isnt the market slightly flooded?
I would assume that he will have to go to offices factories, garages, health clubs etc to ask if he can place a box of goodies on the counter
Has he got the "sales" attitude and confident in approaching other business's on a "cold call".
Maybe a huge more research is needed by your brother, do some leg work and see how many other similar things are about, think he will be suprised.
Then there is the "take it now, pay later" customer, who never pays!
Wrong choice IMO....but good luck to him