If you have time to worry about "how my company can reduce its use of plastics" then there's a problem.
I mean where does it end, use of diesel, ozone layer, organic food, how many trees can I hug etc.
Whether I wang some depleted resin in the bin or not is not going to solve all the problems in the world, stop trying to do your bit, there's too many people in this world not doing their bit for it to make any difference.
So the next time you come to dispose of your resin just say feck it I'm going to die anyway, let's live life on the edge, break a few rules and sling it in the bin.