With an On-Guard bulldog lock still around the frame.
I use locks too, and chain it up to something heavy or fixed. Although, locks don't deter scrotes. They just delay them, if you're lucky.
We believe that we were 'probed' a few weeks ago at around midnight. My
On-Guard GSD is always on the ball with intrusion, he sleeps on a door mat (well, more of a 'lies in wait' job really) facing the entrance to my garage, where my bikes are secured.
His work fee is a bowl of kibble daily and a good run. You can't get a better lock for less than that.
I'm sorry for your loss and I'll keep my eyes peeled for it.
Look close to home for the culprit(s).. Someone who sees you going in and out with it. Someone who knows where it's kept. A green eyed monster that coveted your prized possession.
If you were fortunate enough to have insurance, you'll just get a crime number from the old Bill. Me, I'd be knocking doors, questioning people and using my lie detectors on the local scumbags.
Anyway, this thread has motivated me to set up my spare cam as a security cam. I'll just plug it in facing the back gate and let it roll and roll and hopefully I'll never need to review the video it records.
