Dpo Covers - Discontinued Post Offices

My greatest regret in collecting was that some years ago (25?), I sold a really nice group (perhaps 50) of covers from discontinued post offices.

These were specially prepared "last day" covers from very small towns from the Upper Peninsula of Michigan where I grew up. Many came with actual photographs and notes and letters of the postmaster and the post office building in the envelope.

I have never read anything anywhere about the creation or existence of these covers.

Does anyone know anything about these? I'm working strictly from memory.

I don't know anything about the covers you mentioned, but have seen similar covers from closing offices.

Discontinued Post Offices are usually called DPO's.

Oops. I fat fingered the topic name. Meant DPO.

DPO's where discontinued for many reasons. I collect the postal history of the two major redwood logging counties of California. The DPO's of Humboldt and Mendocino are the results of mills opening and closing. In the 19th century, the moving of a mill or shipping point a few miles brought the population with the move.

Are DPO covers still created?

I was familiar with at least a dozen of the communities with DPOs. All within 30 miles of my childhood home. Most were very tiny post offices. Most with a small handful of employees. Many were less than a couple hundred square feet in size.

Does anyone here have photos of DPOs that they could post? Mine were primarily from the 1950's if I remember correctly.