The 339 and 341 are very common Standard Gauge cars. They were usually sold with the 10/10E electric outline locomotive. There was a matching 332 baggage car available in the same color combination. Those two cars appear to be in exceptional condition (assuming they are not restored) and the boxes add to the value. I'm no expert on valuing these things; I'd suggest posting this query on the Tinplate board for the right people to see it. Better photos might help too; these appear to have been taken in natural light with much of the car in shadow.