Hello carpfisher! Well the term "Kleenbore" has been around since the late 1940's/early 1950's. Now if these are paper hulled shells yes they do have some value, and usually bring a buck a piece, ($1.00) at the auction sites under collectible ammo. Now again if these are paper, #5 shot is a little on the rare side, they might bring a little more. Now if you can find some empty "Red & Green Remington" boxes to put them in at one of the auction sites you could double your price. Those full boxes usually go from $15-$30 depending on the condition of the box and shells. (Empty boxes don't bring much. $5-$10.
Now if these are plastic hulled shells from the 60's or 70's about .25 cents a piece, might as well shoot them. Go over to www.gunbroker.com
and look under collectible ammo- Remington. this might help you.
Yes I have a full set of those old paper shells, 12,16,20,28, and .410, cost me about $85 with shipping and almost 5 years of looking to get the right condition I wanted.