Firstly, bear with me, as I'm working with cell phone images..
Secondly, I know absolutely nothing of the coin, the tpg, nor its history...
That being said, IMHO, I would guess the coin was possibly submitted for conservation. In comparing the 2 slabbed images with the pre-submittal age of the coin, I believe that I can see traces of the damage under the discoloration.
As far as I can see, the marks on the right side of the coin in line with the second "I" of BRITANNIAR, definitely existed prior to submittal...
Insofar as the left side, just to the right of the space between Victoria & Dei, I believe that I can see the 3 small gouges in the pre-submittal image.
Regarding the 3 scratches just to the right of the gouges, I believe them to be just barely discernable under the discoloration.
Again, this is just my opinion, without coin in hand, and with absolutely no knowledge of the coins history.
No intent to malign the coin, the poster, nor the tpg is intended...