With really long rectangular items, taking pictures without the distortion at the ends usually requires long distances between camera and object, special types of lenses, and/or software manipulation to correct it.
I would take photographs in sections and stitch the sections back together. This is likely the best way to get high quality images of the items in question. It is labor intensive unfortunately, but you can speed it up by having a fixed camera/lighting set up. If everything is set up, all you have to do is move the item through the field and snap the number of pictures needed to allow for overlap and trimming
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