Nan, hope you won't be disappointed in Irish Envy; that's one I wouldn't order again. It's okay, just unremarkable. I have not had a problem with rust; maybe you won't either.
Your Post Office sounds like ours; never know when/if/where mail will be delivered. There are only two houses on our lane, thus only two mailboxes at the main road, however we routinely get each other's mail and packages. I sometimes get the guy's mail who lives way down the road. Hope your order shows up and is in good shape.