I recently was given a small ziplock bag full of cut squares from the USA 1960's mostly. The odd thing about the cover clippings is that they are just the circle date cancellation, no stamps tied to them. I was intrigued at first glance because the first town I saw was a small town located on the IL border along the Mississippi River and Route 66

! It was Madison IL which is connected to Missouri via the unique old Chain of Rocks Bridge leading to St Louis. I spent an hour sorting out all the Route 66 towns I recognized and any from Illinois. I had seen late 18th century and early 19th century collections of just postmarks before, but hadn't thought about gathering contemporary postmarks. Especially when the cover is damaged, the cancellation does not tie the stamp to the cover, space constraints, or just for the heck of it. I may have a new collecting facet to work into my topical collections.

Does anyone else have a bunch of useless covers or trimmed postmarks laying around?

Is there any value to this type of collecting?