Hey killer246655,
Generally when legend tokens seem to go missing like this, the most common expenditures are on recolor skins, challenge rerolls, or upgrading packs to the wishlist versions. Just depending on when you had last played it's likely some mixture of these.
Unfortunately we'd only be able to track recent purchases, so if it's been a couple years, the support team likely wouldn't be able to see exactly what those were spent on previously. If you think there's any possibility someone else may have gained access to the account and spent those, I'd definitely check through the security steps here, though I'm afraid beyond that we wouldn't be able to add any additional tokens.