Also TIBA procedures are there and notamed. Those are the rules. No where does it say ATC will hold SAR based on your exit. It states to contact 15 minutes prior to exit to enable SAR and stuff.
To the bloke above who said he landed in the TIBA area and cancelled SAR and HF said the right words, sounds about right. HF will cancel it then go looking for who is holding it. I personally in the reverse scenario of a VFR cancelling a Censar filed Sartime tell them to stand by until I can contact flightwatch and the they accept the cancellation. The Sartime could be held by pretty much anybody and if I know it is not me, I am not saying the magic words until I hear from the person holding it. Bad practice what HF does I feel but otherwise there would need to be much more chatter on already full frequencies.