Thanks for the tip!! I'll certainly will be investigating that for sure!! Many thanks!!

Thanks for the comments. Am happy to close this issue.

All good, thanks for your responses.

It was the same courier company - NZ Post. All parcels were collected last night well after 6.00 pm....

Hi Michelle,   Thanks for your response. The problem is that buyers take the "estimate" as gospel, and pay accordingly.  They are not about to pay extra later, so you may have to consider changing things so the final total to pay is not shown until AFTER the "book a courier" step has been taken. In my case, the delivery address was not a PO Box. The size was "small (11 x 9 x 25 cm's) and light (under 3 kg's) Courier availability - well, I have 3 shipments ready, one was supposed to be collected 20 April - (what is special about that day?) one today (not going to happen now...) and tomorrow ...