Dot, I use USPS Priority sending plants out. The problem
is local mostly. For instance, plants coming from MI have
to go to Knoxville, TN and then back to Corbin and then
out for delivery. I have had to sit in the car and wait for
more than two hours by the mail box to make sure the
postperson doesn't just throw it anyolewhere.
Pretty lucky with my USPS guy but we are very friendly with him and we have a covered porch not too far from the road. One solution/hint might be to put some of those anti-pigeon spikes on the back portion of the mailbox or cut off that back mailbox "tail" altogether!!