Can’t find VIN # on new to me frame.

I bought a used frame for a 2015 Gade with title, a few months ago. I just had it soda blasted and can’t find VIN numbers anywhere on the frame. My 2015 outty has a sticker under seat and a sticker behind the front diff on the frame. Same as my wife 2016 570.

But isn’t it stamped somewhere on this 2015 frame? I have a clean title for it but does no good if it only had stickers that have been blasted off now.