Please any help or wise words would be verry helpful.
They are dated 1993, a time when ST merchandising was at a peak, so I'd assume that these were available in enormous quantities.
Keep your eyes posted on the eBay auction site to see what prices these go for. Your advantage is that they are sealed, but what fun is a jigsaw you never open?
Here's a TMP one of the same ilk, also by King:
30 pounds in UK.