Good save I must say.
Can't remember if this happened after osmas contribution to the air travel and cargo, but we used deliver spares ready to run on airfreight before. On day we rushed a pallet or two (just few parts and they are not cheap) from Finland to Canada, our customer got them an assembled them. They run only few hours before they overheated. They were not empty, but bleed the oil filling out just before shipping. There were instructions on with the shipment, but they apparently thrashed all the "papers". Now service department affixes a great big colorfull sticker to every "dry" part. We tought of the wording a lot because as you stated above wording better convey the idea pretty well before correct action is taken.
We get some smaller gearboxes from Italy, they have a small neat sticker next to one cap, that could be used to add or empty oil, depending which way the gear box is. Some of the mechanicians didn't take action, because it was on language they didn't understand. I mean - if you see a tag on a cap that looks like oiling point, wouldn't that arouse your curiosity?
Long time ago I sent a line printer to my brother. You now the matrix printer type that has a moving head. During transportation that heavy printer head had to be secured with a lengtvice split pipe over guide rod. For not that mechanically minded grater audience that pipe had tag "remove before use" affixed to it with twist wire. My brother called and complained that the printer didn't work. Just buzzed and the printter head did not move. I asked if he moved the transport block. He said "yes, but I don't understand what good that paper does!". He untwisted the wire and removed the tag. This transport block (split corrugated pipe) was made to look too professional, he tought it was a mechanical part of the printer.
Pekka