Some FDC That I Forgot I Had

i was looking for something else in my apartment and found these four covers
i do like the ones with the extra selvage

The Will Rogers & W C Fields covers are both postmarked in Route 66 towns. In fact, Route 66 is also known as The Will Rogers Highway. Thanks for sharing.

i have a question as usual...where do these cover envelopes come from?
does the post office have them made or is it a collector?

The cover envelope with the engraving, is known as a "cachet". The ones shown above were produced by Artmaster. There are numerous competitors in the first day cover envelope market such as Fleetwood, Artcraft, etc. They are mass produced either as serviced covers, or collectors may buy the envelopes only and affix the new issue stamps to them and you typically have 30 days after the date of issue to send them in to the Postmaster at the city where the new stamp is issued to have them postmarked with the special "First Day of Issue" cancellation.

Some collectors today even produce their own envelopes and the post office even makes some special color cancel varieties (at a premium cost, of course) for those interested in them.

It's an interesting collecting topic to some, just don't expect them to appreciate in value all that much. Most first day covers from the mid-20th century forward only command a small fraction of the value of the cover and stamp. The earlier ones are more collectible, becuase of their scarcity.