Ditto what Obsidian said. I would just go to a different post office to avoid any embarrassing encounters with the same employee. Another option is to mail it through the nearest independently-run mailbox store.....or the UPS store. I've used all 3 avenues without a problem to mail my soap, but the cheapest is to go through USPS. Their Flat Rate boxes just can't be beat when it comes to mailing lots of soap at a time...........
Next time, instead of waiting in line at the post office for an employee to print out your labels, etc.., you can do what I normally do when I mail soap: I just go onto the USPS 'Click and Ship' online store from the comfort of my own computer at home to buy and print out the postage label for my package (or sometimes I just use the self-serve kiosk right there at the post office), and when the spiel about hazardous materials pops up on the screen, I click on the appropriate box to confirm that I am not mailing any hazardous material (which I am most definitely not if it is fully cured soap).
Once I have my box packaged up and the label attached, I take it to the post office, but instead of standing in the line that leads to the help counter, I just waltz right on over to the part inside where they have the 'self-serve' mail slots in the wall for mailing envelopes and such. Right next to the regular mail slots, you should see a rather large, curved, pull-down box attached to the wall for mailing boxes and other bulky items (you can see it in this video: [ame]https://www.youtube.com/watch?v=Qstfv7em0n8[/ame] If your box fits (and it should definitely do so if it's any of the Flat Rate boxes), just place it inside and lift the pull-down lever back up to dispatch it to the other side, and you're good to go without ever having to encounter a postal worker....or having to wait forever and a day in the long line at the help counter. lol
By the way- on that pull-down box you'll see a sticker attached with the "13-ounce rule". The rule only applies if you are using regular postage stamps to mail your package. It does not apply to boxes mailed with the 'Click & Ship' labels.
IrishLass