2007 F150 5.4 V8. Here's the plugs in question. http://www.amazon.com/gp/product/B006DDHZ1K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

I went ahead and contacted Amazon, they're over-nighting me 8 new plugs. Hopefully they'll use some packing material this time!

Edit: I'm already overly paranoid as it is. The truck has 42k miles on it, and these are the original plugs which, apparently, were notorious for disintegrating upon removal.

Thanks again for your quick response, I really appreciate it!