Just a follow-up, received the caps today, Sunday. They were left on my front stoop. Adult signature required. NO ONE in the house signed anything. Fed-Ex delivery update says signed for by "JCovert".
I would think in light of recent events that Fed-Ex would be a bit more cautious about following through on firearm related hazmat delivery procedures, rather than pandemic expediency.
Oh well. They fit into all my inline cappers perfectly, and fit all the nipples. I'll have to wait 'til I get to the range to test how well they work in live fire.