The court can draw inferences from your silence, but generally there would need to be further external evidence (circumstantial, hearsay etc) for those inferenc

The court can draw inferences from your silence, but generally there would need to be further external evidence (circumstantial, hearsay etc) for those inferences to mean anything. Unfortunately in this case, the offence is complete when you don't say anything (don't give up the key(s)). And just for completeness, the caution in the UK is: "You do not have to say anything, but it may harm your defence if you do not mention, when questioned, something which you later rely on in court. Anything you do say may be given in evidence."