Any photo created using a digital camera, and which is not in RAW format, has been 'post processed' by the camera. Cameras interpret the scene and employ varying, and often very considerable, degrees of contrast / colour/ tonal modification depending on what it 'thinks' the image is and what it thinks the typical viewer will see as 'real' or 'good'. Those are all choices made by the camera's firmware developers, so they are effectively doing the 'post processing'. If a photographer takes the RAW file and post processes it in Photoshop, or any other application(s), then that is a major part of the creative process.