WP&Y Container Flats

Does anyone happen to know what type of paint scheme the White Pass container flats built in the 60's carried. The Sumpter Valley has numbers 1147 and 1185 and we'd like to return them to an as built appearance, or at least as close as we can. The numbers are still on the cars, but no other lettering exists, and we aren't sure if there ever actually was any. Any information about these cars would be very appreciated. Also, any information on the paint and lettering of the wood sided White Pass bottom dump gondolas would be appreciated as well as we intend to try and restore at least one of ours in the near future, hopefully as close to as built condition as possible.
Thanks in Advance, Taylor