For anyone that does not already know, the USPCS has updated the Alexander census and put it online here
https://www.uspcs.org/resource-cent...over-census/The database is fully searchable. If you click on "advanced search" you can search on origin city, origin state, destination city, destination state, addressee, franking, date range, etc.
There are 7 covers in the census from Doakesville, Indian Territory, and 9 covers addressed to Ms. Lear in New Orleans (obviously not all from Doakesville).