overit500 -- "I thought mail count was the last 2 weeks in Feb? Am I reading the dates wrong, or is the majority of count actually in early March? "
-- Unless some other alternative method of evaluating routes in place ( unlikely ), the current contract calls for a national mail count beginning 24 FEB 2018 and ending on 09 MAR 2018.
-- That, in theory, is somewhat better dates than the 2016 count which ran from 12 to 25 March, missing both the end- and beginning of the month mailings.
"If this is the case, then most of our end-of-month mail will come the week before count for sure."
-- If that happens and you can document when end-of-the month or the beginning-of-the month mailing had previously been received, add that info to the reasons you won't sign off on the count numbers.
-- Not that it will help your case, but you will be able to confirm some type of "manipulation" of the mail flow at the most inopportune time does happen. District may even respond to your observation with a standard form with the "mail availability" box checked!
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gotstamps -- "I’m on the fence on whether to count or not since I’ve always had to, so I’m not worrying about it until January. My luck will likely be that I won’t get the choice anyway."
-- The "Opt-Out" option is available, but can be over ridden by District as demonstrated in the past when local postmaster agree with the carrier too early.