Hi Jon,
Croft & Allen did have some items that were likely distributed with their candy packaging such as the non sports card below.
I do not believe, however, that any cards were distributed within their cocoa tins or glass jars.
My theory on the E92 cards with Croft & Allen and Crofts Cocoa backs is that they were likely handed out with the purchase of some product(s) at their local retail stores.
The Crofts Cocoa back is actually an advertisement for the Montague and Company retail distribution chain of stores and my thought is that the cards were made available at those stores.
As far as a rough value on the tin, I'd say somewhere in the $20-50 range is a fair estimate.
Crofts Cocoa glass jars (without the label) are pretty common on eBay in the $10-20 range If they have the label, however, they usually go in the $100-300 range depending on condition.