I confess to knowing nothing about B-C Models, except that they appear to be a US firm, and at one time produced the baggage car kit illustrated below. Were there other kits in the range? How many? Where were they made? When were they made?
The wording in the illustration appears to say B-C Models 1001 Streamlined Passenger Car. The sides seem to be stamped metal, with a wooden floor and roof. I am guessing that the two packets hold the car ends, and perhaps small detail parts, with the choice of trucks, wheels and couplings being left to the builder.