Any thoughts on size bubble mailers to buy

[glchen]

Rick, thanks for your feedback. Now that I think about it, could the reason for the charge be that I requested a receipt of the Acceptance scan? I think this is what the Postal Clerk may have been trying to explain to me. That I could stand in line and watch her scan the packages, but I wouldn't receive a receipt, and she wouldn't charge me. However, if I wanted the receipt for the Acceptance scan, then I would be charged. Is this it?

The reason for the Acceptance scan with the clerk is that sometimes if I drop it in the postal box whether it is inside the Post Office or in the blue collection box outside it, it doesn't always receive an acceptance scan. Here's one example of a tracking number that never received a scan even though I dropped it in a blue collection box: 9407409699938922193528

It did arrive on time, but there are sometimes when the packages are delayed a bit. Thanks again!