Hello,
Just to follow up on this issue, I reached Apple and it insisted that I went to the nearest Apple Store to have a look at the issue, as sending through mail was not permitted. The nearest Apple Store required me to take an airplane, so that was a no-go. So I had to find a way to fix it myself or live with a broken key.
I ended up removing the key completely by snapping out the bottom-left snap. Indeed the case was that the top-right hinge came out before the bottom-left snap, and it was slightly damaged.
I ordered a new key from ReplacementLaptopKeys and it came with the same damage I described. It seems it’s really too easy to damage that hinge. So I ordered a new one from TheBookyard.com and this time, the snaps and hinges were perfect.
The only difference in the keys ordered from the original one was that the ordered keys were of a slightly lighter shade of black, a difference only visible to the most trained eyes.
Anyway, the key is working perfectly now, (almost) as new. Thank you all.