Curate, connect, and discover
Crowley using the evidence envelope as a frame for the photo for a moment before passing it to Aziraphale.
He looks at it for all of 15 seconds and that's what he did. He put the picture of them in a little frame in his hand for a moment, like how he could do with an actual frame if they weren't a secret, if they could be people with photos of themselves openly in a little place they have and not just this one in an evidence envelope that was taken by the guy who is trying to get them killed over it.
That is the saddest, most adorable...