I think you mean the partial palm print that turned up a week later on an index card, and fibres that may or may not have come from Oswald?s shirt.
You think a lot of things, don't you John.. such as how the 'fibers couldn't be dismissed as being from Oswald's shirt' remark somehow differs from your 'fibers that may or may not have come from Oswald's shirt'
A goodly number of these 'couldn't-be-dismissed/may-or-may nots' exist and are worthy of serious consideration, whether detractors like it or not.
In regards the partial, I have no information as to
when the investigators decided to check for prints on the rifle in it's broken-down state.