It's the same for me with G1 Devastator. I would love to have all the original Constructicons but they have been KO'd that many times, that the second-hand market is flooded with counterfeits.
It's the reason why I recently purchased my MOSC Scrapper as up until recently, that was the only way I was going to own them all. It gets very expensive as you can imagine.
Luckily I just purchased Scrapper prior to the KO Constructicons being made although there are ways to tell which ones are fake unlike a MIB Reflector with stickers applied.
I've now given up hope of ever owning a legit Devastator
