Did the stealing occur in your home town? Do you show up in people search tools?
It was pretty easy to pin it down as I had been ill a few weeks and done basically 0 in-person, physical card transactions in that time. It was a restaurant where they bring you the bill, then walk away with your card for a few minutes (which is becoming less the norm these days).
It has pushed me to only use my Apple Card for these types of purchases where the physical card goes out of sight, as theres 0 card info on the card for them to snap a photo of.
Are these also magnetic strip cards?
We also never got rid of swipe, and most cards have their number/expiry/security code printed right on them. Everything you need to go shop online with someone else's card...
It's terrible infosec all around.