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@digital*ghost wrote:

(For example, a couple of years ago I contacted AP via Facebook about a missing letter to the US. The UC number didn't do anything is entered into AP's or USPS's tracking tool, but the rep from AP could see in their system the date, time and location it was lodged)

Just a question about the CN22 form (green form) - so you attach stamps/pay for postage and lodge over the counter at AP as letter rate? Do they also accept the more detaile CN23 forms for letter too or are these just for standard and not economy? I may try this when there is a vaccine and I again have trust in international postage (i use to put mine in the postbox without declaration and had quite a few missing parcels or late parcels). 

Your advise about the form being traceable is good advise to stall for time in a case. Also (i don't have any CN22 forms on me now) but the ones i'm looking at on google have the barcode number starting with LC (not UC) and finishing in AU.