I have one of these I first purchased in 2000/2001. Offer date blacked out. Card in good knick. The bubbles right corner goes almost half way into the 'C' of the Chewbacca text on the yellow graphic, which I've only seen once on another version of this Chewbacca looking at pics... It just so happens to be exactly like the one posted above with the price sticker residue. My point is leading to one thing which never quite gets a mention with regards to fakes is the corner of the bubbles. It tends to be overlooked possibly...
We know TT used to iron between stems (he wasn't very observant) and very crude.
We know he used the wrong bubbles and didn't care too much, he just wanted to make a few quid each time (that was his goal).
We know Palitoy produced smooth bubble seals (no waffle) inconsistently throughout the ROTJ line.
We know the machines at the time sealed the bubbles firmly at the side, angled right in at the crease where the bubbles edge meets the bubbles plate.
This left the 4 corners of the bubble more exposed to not being sealed and less exposed to the heat during the factory process.
It is possible the corners of the bubble prise away from the card with time... but if I was actually looking for TT I would be looking for these 4 corners to be firmly sealed to the card. On an original Palitoy I would expect to be able get my nail or scalpel underneath the very corner. Just a consideration.