These figures were released in 1984 after LJN acquired the license to produce a line of three 6-inch figures for the Temple of Doom but despite high expectations it was disappointingly short lived and sales were poor and so many of the planned figures were never released, although a few did make it to the prototype stage.
The three figures that were released in this line had identical backing cards, except for the character identifier sticker on the front of the packaging. These generally sell for between $50-$100 with the Indy figure selling for approx $150-$200.
Two of the figures that never quite made it to the production stage but had prototypes made, these were Willie Scott and Short Round.
There was also a prototype of a Mining Cart play-set, which never made it to production but looked like it could have been a really cool addition to the line.
The Official Price Guide to Action Fgures Second Edition