You might want to attach the files your change-log generated, or you can do some of this yourself with an editor (DLTCEP or NearInfinity). For c-cs.itm, check the inventory icon. In my ancient BWP install, this file (ic-cs.bam) doesn't exist, so some other mod (or a later version to Deeper Shadows of Amn) may have added it. What you describe is a common issue; BAM Batcher in my signature has an option to fix such BAMs ("Fix inventory BAM coordinates"). Edit: you may want to do a change-log on that .bam file while you're at it too.
For telswd.itm (an item that exists in unmodded BG2), open the .itm files the change-log generates, look at the description string reference, and see at which point the description gets hosed, which should point you to the offending mod. My guess is Item Revisions (heh... old joke of mine... but your change-log does in fact list it among other mods that change the item).
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