Taken from 2015 Hagerty article:
"Classic car theft is rare. Less than 1/10 of 1 percent of classic cars are stolen every year. Thefts are most likely in large cities or in these states: California, Florida, New York, Texas and Michigan. Corvettes, Impalas, Mustangs, Chevelles and Camaros are the five cars most likely to be stolen. Essentially, the risk of theft is higher in popular areas and with more popular cars."
We have had police security at the meets and tours I've hosted. Sounds like this one was stolen near but not at the show. It is hard to protect them when traveling.
Anybody ever tried Lojack for Classics?