Thanks Chico2, I will try the tuna and blanket trick. I have a box on the porch with a small pillow and tshirt of mine currently. I have put his food out but the racoons eat it.
We have been out looking at night regularly but have seen no sign of him, just another cat that we have had a few calls about following our poster blitz of the local post boxes.
For a big cat, he is really nervous so I fear he has gotten further away with each encounter. We also have a condo construction site nearby and I fear he has wandered into it and had a misadventure.