Here’s a short list of what to take with you when you’re ready to drop off your mail:
All of your mail (count your containers!).
Signed and dated postage statement(s).
Supporting documentation (your tally sheet or printout from presort software).
A check or cash to cover any additional postage due (if you’ve put precanceled stamps or meter postage on your mail). In lieu of a check, you can affix a meter strip to your postage statement to pay for the additional postage.
TIPS --If you want a copy of your postage statement for your records, then you’ll need to bring two copies with you -- one to turn in with your mail, and one to keep. --The Postal Service uses this documentation to verify the postage rates you have claimed on your mail.
What to Take 
