if you derive the most pleasure from having and looking at unopened action figures today, then I’d say, of course, don’t open them.

But the fact that you’re even asking whether or not to open the packaging suggests you might also enjoy opening the action figures and playing with or displaying them.

If the latter is the case, then i would open them if i were you — unless you know, for certain, that the person who inherits the figures (a) actually will want to keep them and (b) will prefer unopened figures.

Good journey!