In reply to RKernan:
I returned mine for re-slinging back in July 2016 and was emailed a code/authorisation number by BD following my initial email to warranty@bdel.com to enquire about re-slinging. They call it an RA# code (returns authorisation code) and told me to write the RA# on both the outside and inside of my package.
I posted them (8 cams up to size 4) with Royal Mail and paid the extra to have £500 of insurance. I made sure the amount of insurance would cover buying brand new cams in case they went AWOL and tbh it was only a few quid extra as 1.5kg of cams isn't cheap to send to the USA. The service I used (Global Priority - Guaranteed 4-5 days) also had tracking so I knew they'd at least got to the USA and BD.
After that it was like they gone down a black hole and it wasn't until FedEx contacted me to provide some stuff to clear my cams through UK customs that I knew they were on the way back to me. It took almost 4 weeks from posting the cams to them being back with me. I reckon about 2 weeks of that time was spent in transit/customs etc.
FWIW, I found BD sometimes took a week or more to respond to any emails and contact/response could be a bit hit and miss.
Assuming your parcel was tracked I'd check that it's actually been delivered before contacting BD again and maybe try phoning them if email isn't working? Another option might be to contact the European side and see if they can find out what's happening for you.
Good luck and fingers crossed your cams reappear soon.