As
@neciat asked, are these FIRM bundles? A bundled set of flats to a business. Such as a school.
If your office gets paid for Withdrawal. P.O. 603 212.11
"As directed by your postmaster or supervisor, withdraw, measure, and
record (if applicable) from the distribution cases all mail for your route that
has not already been placed on your case ledge by a clerk or mailhandler.
Normally, no more than two additional withdrawals should be made in the
morning."
If your office doesn't get paid for Withdrawal. P.O. 603 212.21
" If employees other than rural carriers withdraw mail intended to be cased,
they must place it on your case ledge as described in 212.13."
I would argue a hamper is not a distribution case ( withdrawal office) or...