The Canelo cards have really gone up. I just sent off one of the certified signed RCs for slabbing; that card can go for $2K.
There are a # of modern cards like that lately. I also sent this one for grading, because it can go well into four figures slabbed:
Hopefully, they will be back before a card show I am setting up at in August.
https://www.burbankcardshow.com/
Come visit; there will be lots of esoteric boxing cards and memorabilia at my table.
Oh, and a modest p/u: