Eagle Scout and all: I received my order of stash tins from
www.thegrooveshack.com today.
My order took a long time to arrive because one of the designs I'd chosen was out of stock. The Groove Shack customer service was very good, once I contacted them by e-mail. (Messages I left on their telephone answering machine were never answered.) They explained the situation and offered a substitute, but I chose to wait.
The design isn't very important in the end. Each of the three samples I received was a plain black box with an adhesive label on the lid. The label is easy to remove, leaving a plain box.
The tin dimensions are: 1 x 3-1/8 x 4-1/4 inches. This is exactly the same size as the BCB tins I have. The metal seems comparable in gage. The lid seal is a soft plastic gasket, well attached to the lid rim.
In short, I think this is a viable source for empty tins. You might want to contact them first to make sure your choice is in stock, or to specify that pattern doesn't matter.
Bear