Two AMT Ertl Mack R685ST 1/25 scale truck model kits. One is the T535 and the other is 6656. These kits featured CB radio antennas, roof-mounted air deflectors and Maxidyne turbocharged diesel engines.  T535 appears to be a complete open box kit with parts on sprues in factory sealed packages with literature, instructions, decals, etc.  Box lid is concave, bright, clean, square and solid with a little light wear.  6656 is a box with several bags of parts, some assembled, some painted, some loose, some on sprue.  Engines, transmissions, axles, rear ends, body/cabs, chrome and painted parts.  Box shows light wear, bright, clean, square and solid.