I'm posting this here from another forum to spread the word.
Sharing a message from Michael Zadroga posted in the Facebook BMW-K (purists) group. He found a Mystic Red Top Box from most likely a 90s K1100LTse on the road in Kingston, NY a few weeks ago. He's looking for the owner, or possibly just a home as he's packing and it needs to go.
The box had a K1100lt/rs service manual in it. If you lost this or know someone who did, contact Micahel via Facebook. Or DM me if you can't reach him. If you need one, leave your name with him and he'll probably give it a home if the owner doesn't appear.
https://www.facebook.com/michael.zadroga?fref=gs&tn-str=*F&dti=107241889314606&hc_location=group_dialog