In the example shown in FIG. 4, the article location indicator 18A above x-ray image 17 b is partially lightly shaded and partially darkly shaded showing that article 4 b (FIG. 2) corresponding to x-ray image 17 b is passing into cleared article access region 13 from article removal region 12 and is, or is becoming, accessible to being retrieved by passengers or other persons in the secure area be