Montgomery Wards, 1956:

Aldens, 1956:

Montgomery Wards, 1958:

Mmm, candy! These fellows are part of a smaller subset of the value-added models that populated holiday mail order catalogs in the 1950s and 1960s. Hobbyists are more familiar with the other sets - the Grooming Kits, Sewing Kits, School Kits, and so on - because their "added value" was not meant to be eaten.
The "Candy Packers" most commonly appeared in the Montgomery Wards catalog, and is from where I derived the name. No specific name or brand is attached to the half-pound of hard candy that came with them; it was probably some generic store-brand mix.
It’s not likely that an "intact" Candy Packer is going to be found because - well, it’s candy! I’m also pretty sure the first thought of anyone finding a horse with a fifty-year-old bag of hard candy is going to be more like"Ew, ew, throw it out, throw it out!" rather than "Hey, let’s put this on eBay!"
(I know, I know, that’s not the case with vintage PEZ. But I think that stuff has a shelf life measured in centuries.)
If Reeves wants to get some slower movers off the shelves, throwing in a free bag of candy wouldn’t hurt (unless it’s Spearmint Leaves or Circus Peanuts. I’ve been known to indulge in some questionable eats to satisfy my sugar cravings, but that’s where I draw the line.) M&Ms in a custom blue and gold mix? Suckers in the shape of the Breyer logo? I’d go for that.