I'd watch eBay and any and all fly fishing forum sites that have "For Sale" threads, that may have these brands of items listed at "give away prices".
Especially "sudden new members" that pop up, offering to sell Sage, Winston, etc. obviously.
A Portland, Oregon shop was robbed 3 years ago and the idiot thieves listed 50 items on eBay, within 36 hours of the robbery, it wasn't hard to catch them!