It's possible to get that high without exploits. Takes a lot of coordination, nearly flawless execution, and good luck regarding map layout. Saw a video of a squad doing 36k, and they made several mistakes, so 40k is not out of the range of possibility.
I haven't tested this myself, but people in trade chat are advertising Ignis Wraith blueprints, and two of them I contacted confirmed that they are indeed tradeable. What the hell? I thought this was supposed to be an exclusive reward for clans who did well in the event, and now people are just handing them out? Is this intended? EDIT: Just tested it and yes, it does appear to be tradeable.