This goes back a ways but it happened to me and quite a few of the northeastern pipe community knew about it and can confirm.
I was told by a friend about an antique shop that had some pipes for sale. I went down there and there was really nothing special, a Dr. Grabow and some no name pipes with fills but I gave the guy $10 for good will and told him to call me if he got any others in.
About 2 months later he calls and says he has a bag of pipes if I was interested. I went down and he handed me an A&P bag to look through. The first one I pulled out was a patent date Dunhill Churchwarden with AD sterling band. I pulled out another Dunhill, a Sasieni 4 dot, a couple others. At the bottom of the bag I pulled out a Dunhill Magnum Pot shape from the 1930's. The guy tells me the case was in there and sure enough it was. And a second Dunhill Magnum, the more common bent shape.
He tells me he wants $300 for the bag, I paid and left. I was on the phone to Rob Denholz as soon as I got in the car. You never know what you'll find in those small shops.