Collectability of 28g paper hull slugs?

Hi guys, new to the forum.

A friend came up with two boxes of Remington Express Extra Long Range 28g paper hulled Rifled Slugs. Red and green box.

Are these shooters or worth researching?

In my humble opinion, anything that is not made any more will one day be worth more than it was new. Remington has not made paper hulled shells since about the 1960’s, I believe. I would hold on to them or trade/sell them to someone who will… then buy some newer stuff to use. Old ammunition is likely not to function anyway, in many cases.

Some pics would allow for a more learn-ed opinion.