Not sure if these would be unexpectedly high values as most people know they fetch a little bit, but I have all my old N64 games still boxed with most of the original inserts too. The one I know most would be Conkers Bad Fur Day, that always seems to fetch a nice price.
A couple of my Funko Pop figures are possibly worth a few hundred but nothing more.
And I have the full set of Hobbit and Lord of the Rings Lego sets which I know go for a bit over the original price.
Roller Coaster Tycoon 2 Can easily spend hours creating a park or that one coaster.
Tetris An easy pick up and play game but could also last a long time if you’re good.
Links Awakening (Switch Version) This has always been my favourite Zelda game and I’ve played the switch version at least once a year.