Let them know. I think PM's to Adam often work best. PB will most likely send you the missing stuff.

Or you could take it as a sign ... The quality of the screws are not that great, so this might be an opportunity to get some high quality stainless steel ones. Also an opportunity to spend endless hours surfing eBay, Reverb and parts sites looking for an alternative to the plain neckplate...oh oh, this is starting to turn autobiographical ;-)