Sum and total though, the original files, including additional images as described in the documentation for IH4 follow the source server namng convention of ZC. The original files can be found in the designated folder, then with the name assigned to the main image as the prefix to the image and whatever suffix was applied whether automated or self designated. Each such image to have the same extension (.gif, .jpg, etc.) as the primary image. Thus addtional image location code would work the same as base ZC functionality.

That said, to find the resized image(s) the above discussion applies, but from the sounds of it, the issue was tryng to locate the orginal files. If the resized files are the target, then need to invoke the applicable code to translate the desired image to the bmz_cache related file.