I am currently in the middle of my long Dark Age and I am trying to identify the polybag that was sold separately in Poland around year 2003. It had a number, airholes, LEGO logo and yellow accents, it contained assorted, mostly useless (including non-matching) parts in weird colors.
I am absolutely sure these were inside and I know for a fact that parts differed slightly on bag to bag basis. It looks like these were excess throw-away parts.
Can somebody kindly shed some light on it, what was that and why would they even sell such things? For the record I have never had any of the sets in which these parts were originally used (according to Rebrickable).