Hello EB,
I'd just like to mention that I recently bought a sealed 7862 Remote Controlled Decoupling from 1981 for a very good price, and I opened it on video. I'm still working on editing the complete video but I will post it to YT and link it in this topic when it's up. It was a real experience to open a sealed set! I've never opened an 80s set before. The box is in excellent condition, before I opened it still in the cellophane, and all of the parts are of course in mint condition. It even had the 1981 small train brochure.
-Reker1000000