Don't worry, BTB, the post is a disaster everywhere at the moment!
Postal services in most countries are working reduced hours with skeleton staff, so it's impossibe for them to deliver as they would have before.
On top of that, there are less flights flying, so transport companies don't have as many options or slots as before.
But if it's Ballast or Gypsum wagons that you're waiting on, they probably haven't been posted just yet!