Is there a happy end to this story as the OP did not post yesterday?
He is covered under the Distance Selling Regulations and is entitled to an immediate refund or replacement. The issue of the disappearance of the item is the responsibility of
CRC.
I have to say my recent purchases from CRC have not gone smoothly. They used to be good, well quick to dispatch anyway. They do take an age to reply to emails and whilst using live chat you are able to communicate with a CRCbot they are pretty useless. Last year I ordered some Shimano hydraulic trekking brake levers at about this time to be delivered before Christmas. What turned up was a Shimano XT rear derailleur which I didn't even order or want, and it was scratched. So I emailed them them with pictures. After a couple of days they finally replied, really apologetic their email was. They would send me some more levers, but this would not be until the New Year when they would have them back in stock. I wasn't best pleased. In the mean time they could give me a refund for they said it was clearly their error. Well of course it was! The rear XT derailleur they had sent me in error they didn't want back. Then after Christmas the correct hydraulic brake levers that I had ordered at the start of december turned up .........
And then about one month ago I ordered some winter bib cycling leggings that didn't arrive presumably went missing. They said although Royal Mail had collected them from CRC, RM could not actually establish where they were in their system despite them being sent by tracked mail, so they were written off as missing in transit. CRC sent me another pair by next day delivery signed for which I received two days later.
So sometimes it's not CRC's fault and sometimes it is. The fact that you state your delivery box does not seem to have been tampered with and is still intact suggests that the problems lie with CRC's own picking or dispatch departments not their courier, but this is not your problem. You would just like the goods you have paid for. If you don't receive any indication when you will get them soon and a refund is not forthcoming either use Paypal for a charge back for non delivery of item or approach your credit card provider to get them to make a charge back (s.75 of the Consumer Credit Act I think).