BTW had the same issue with the french Steel. And even though I knew they had these issues and was super carefully removing the J-Card with the gluey blob, it happened. Returned both because FMJ also had some dings.
My German SteelBooks turned out pretty mind though: The J-Card is not attached by blobs but the round transparent stickers. Could easily be removed as usual.
Too bad you need that UK J-card even though everything else is exactly the same.