I have a cabinet card that when I purchased it, it was complete and undamaged. When it arrived, the seller had packed it rather casually and a piece of tape got stuck to the card and lifted a big chunk of the emulsion off the base. FORTUNATELY, the emulsion chunk remained intact and was able to be separated from the tape. I have saved the chunk. Does anyone here know the best technique for re-attaching the chunk? I believe it is an albumen print but I could be wrong, and it could be some kind of collodion print.

Here is the damaged card:

And here it is with the chunk re-attached in Photoshop:

The chunk actually fits better in real life than I was able to make it fit via Photoshop - if/when reattached, it would be a nearly seamless blend.