You can destroy them for 2 compendium levels at least, or open them and offer them all as recycled items for that silly charm thing.
I mean, I was planning on buying more crates anyway like I said, I kinda wanted all the sets in the end, but the ones I wanted the most I still haven't gotten (Like the Venge set too).
And perhaps with the 11 levels from buying more crates I'll get the immortals I want too, but probably not lol
I know they are unsellable/tradeable or whatever, they can only be gifted once or whatever is the rule right?