Use something like an isesamo tool. You don't need to buy this.. but link shows a picture.

https://www.amazon.com/TOOLISESAMO-iSesamo-Electronic-Device-Repair/dp/B00792JJK4

Heat it & bend it back.

I'm curious how that could happen, but am reminded of the franks and beans scene from the movie "There's Something About Mary".   

Hahah  How did you even remember and see the connection 

In trying not to loose the thread here.. a car panel remover for levering, and; heat it a bit so lid and back becomes a little more flexible.

Quote from: FestitaMakool on April 08, 2021, 06:11 PM

Hahah  How did you even remember and see the connection 

Experience.  It's why I wear Levi's 501 jeans now.   

.. Safe
But they’ve changed them, careful - they may sneak in a zipper at some point 

Of note I am not familiar with the new Systainer's. Can you pop the outer hinge pin out? On the previous model Systainer's they can be done from the outside with a sharp object. You also might be surprised how much force these boxes can take before failure, meaning you might just be able to pry the box lid up enough to slide it back in, just using more force than previously. I would just pry it back over the top myself, with a thin flat metal object, or two. Razor knife blades are thin.

Thanks for all of the suggestions, everyone!

I used a pair of automotive panel tools and pried it apart "cold" (70-ish F, 21-ish C), and it popped back into place.

Opened the systainer to find the splinter guard and track end stop floating around aimlessly in the case and the top styrofoam retainer split in half.

The rest of the experience I'll share with the good folks in Lebanon, IN.

FWIW, I received another item from Recon today (my T18+3, which was super exciting), and UPS decided that it, too, should be transported on its side.  The battery and chucks were all somewhat randomly askew in the systainer, but it's a small enough unit that they were at least mostly in their little nooks.

With the weight of the saws and the rather delicate nature of the systainer inserts, you'd think they'd put a "This end up" label on their shipping boxes to keep things from breaking when being tossed around by package handlers.  Maybe "this end up" handling costs more?

 To solve this jam, you can try to force  back the walls to the normal position using a knife or a thin blade or a very thin skrewdriver. This will leave however some marks on your systainer.

These issues are the main reasons why I am very strongly opposed the gen 3 Systainer3, even hating them. While the new middle hinge was supposed to prevent such issues, the use of much thinner plastic (too supple) for gen3 not only defeated the purpose of this new hinge, but it made things much worse.

Re. gen 2 (T-Loc) , besides some machines I bought a huge number of empty systainers (So this is statistically relevant): I never had this issue.

Now, with the gen 3 , it is completely different:
- I bought a few empty ones: one had this jam, so I returned it.
- I bought a single machine (Vecturo) with a gen 3 systainer: it had this same jam in the back. However I urgently needed the machine, so I could not return it just because of the jammed back, so I had to solve it myself with a knife (and damaged the systainer a bit).

In conclusion:
- Out of huge number of gen 2: never had the jam issue.
- Out of very few gen 3: had twice this issue!...
What I think of gen 3 is not polite enough for me to write ...

Good luck ...