Nope, not strange al all. I think thieves and potential thieves realize designer handbags are big money/big profit.
I don't think the story was posted here, but the Milan Boutique was robbed last March and the Carmel boutique was robbed in November of 2014. In Milan, about 20 or so bags were stolen and a $35K Croc Roma was stolen from the Carmel boutique along with a few other bags.
I don't know about anyone else, but personally I'm always a bit leery when there is an authentication request and the member doesn't know who owns the bag (buying it from a friend of a friend based on pics only) or is some random Instagram seller. I would imagine all boutiques and department stores have an inventory control system in place and with unique ID numbers for some brands, they should be easy to trace should they turn up. Imagine buying a $3800 BV bag from a friend or Instagram seller and taking it to the boutique for some reason and the SA runs the authenticity tag and informs you it was stolen 16 months ago. What would happen to your bag? Would it be confiscated? Would you be charged with being in receipt of stolen property over a certain dollar amount? I would die of embarrassment.
I'm sure the stolen Chanels net an amazing profit, but I guess the thieves don't realize how tragic the resale is for Bottega.