Honestly at expos, I don't think I've ever seen a captive bred indo species BTS. Not that there are many BTS at all, but the one or two vendors that have them are the 2 that definitely sell substantial numbers of wild caught animals in general and have dozens if not triple digits in species available.
If it is an aninal at one of those tables and it isn't specifically marked captive bred like a few things they sell are marked, it is typically safest to assume wild caught or captive hatched and imported. That is only a small subset, so take it with a grain of salt of course, but I don't think there is a huge supply of captive bred ones available at expos or pet shops to make up a majority of ones sold.
Just my $0.02.
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